diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5b7a16811..40ec4aa8f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -48,33 +48,9 @@ if(LINUX OR BSD)
   set(CMAKE_POSITION_INDEPENDENT_CODE TRUE)
 endif()
 
-# Release build optimizations for MSVC.
-if(MSVC)
-  add_compile_definitions("_UNICODE" "UNICODE" "_CRT_NONSTDC_NO_DEPRECATE" "_CRT_SECURE_NO_WARNINGS")
-  foreach(config CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
-    # Enable intrinsic functions, disable minimal rebuild, UTF-8 source, set __cplusplus version.
-    set(${config} "${${config}} /Oi /Gm- /utf-8 /Zc:__cplusplus")
-  endforeach()
-
-  # RelWithDebInfo is set to Ob1 instead of Ob2.   
-  string(REPLACE "/Ob1" "/Ob2" CMAKE_C_FLAGS_RELWITHDEBINFO "${CMAKE_C_FLAGS_RELWITHDEBINFO}")
-  string(REPLACE "/Ob1" "/Ob2" CMAKE_C_FLAGS_DEVEL "${CMAKE_C_FLAGS_DEVEL}")
-  string(REPLACE "/Ob1" "/Ob2" CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO}")
-  string(REPLACE "/Ob1" "/Ob2" CMAKE_CXX_FLAGS_DEVEL "${CMAKE_CXX_FLAGS_DEVEL}")
-
-  # Disable incremental linking in RelWithDebInfo.
-  string(REPLACE "/INCREMENTAL" "/INCREMENTAL:NO" CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO "${CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO}")
-  string(REPLACE "/INCREMENTAL" "/INCREMENTAL:NO" CMAKE_EXE_LINKER_FLAGS_DEVEL "${CMAKE_EXE_LINKER_FLAGS_DEVEL}")
-
-  # COMDAT folding/remove unused functions.
-  set(CMAKE_EXE_LINKER_FLAGS_RELEASE "${CMAKE_EXE_LINKER_FLAGS_RELEASE} /OPT:REF /OPT:ICF")
-  set(CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO "${CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO} /OPT:REF /OPT:ICF")
-  set(CMAKE_EXE_LINKER_FLAGS_DEVEL "${CMAKE_EXE_LINKER_FLAGS_DEVEL} /OPT:REF /OPT:ICF")
-else()
-  # Force debug symbols for Linux builds.
-  add_debug_symbol_flag(CMAKE_C_FLAGS_RELEASE)
-  add_debug_symbol_flag(CMAKE_CXX_FLAGS_RELEASE)
-endif()
+# Force debug symbols for Linux builds.
+add_debug_symbol_flag(CMAKE_C_FLAGS_RELEASE)
+add_debug_symbol_flag(CMAKE_CXX_FLAGS_RELEASE)
 
 # Warning disables.
 if(COMPILER_CLANG OR COMPILER_CLANG_CL OR COMPILER_GCC)
@@ -84,17 +60,7 @@ if(COMPILER_CLANG OR COMPILER_CLANG_CL OR COMPILER_GCC)
 endif()
 
 # We don't need exceptions, disable them to save a bit of code size.
-if(MSVC)
-  string(REPLACE "/EHsc" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
-  string(REPLACE "/GR" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
-
-  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /D_HAS_EXCEPTIONS=0 /permissive-")
-  if(COMPILER_CLANG_CL)
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /clang:-fno-rtti")
-  endif()
-else()
-  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-exceptions -fno-rtti")
-endif()
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-exceptions -fno-rtti")
 
 # Rewrite paths in macros to be relative to the source directory.
 # Helpful for reproducible builds.
diff --git a/CMakeModules/CheckCXXFlag.cmake b/CMakeModules/CheckCXXFlag.cmake
index ef1b3ffcc..7dcfd1b2b 100644
--- a/CMakeModules/CheckCXXFlag.cmake
+++ b/CMakeModules/CheckCXXFlag.cmake
@@ -1,8 +1,14 @@
+# SPDX-FileCopyrightText: 2019-2026 Connor McLaughlin <stenzek@gmail.com>
+# SPDX-License-Identifier: CC-BY-NC-ND-4.0 + Packaging Restriction
+#
+# NOTE: In addition to the terms of CC-BY-NC-ND-4.0, you may not use this file to create
+# packages or build recipes without explicit permission from the copyright holder.
+
 include(CheckCXXCompilerFlag)
 
 function(check_cxx_flag flag var)
-    CHECK_CXX_COMPILER_FLAG("-Werror ${flag}" ${var})
-    if(${var})
-       set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${flag}" PARENT_SCOPE)
-    endif()
+  CHECK_CXX_COMPILER_FLAG("-Werror ${flag}" ${var})
+  if(${var})
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${flag}" PARENT_SCOPE)
+  endif()
 endfunction()
diff --git a/CMakeModules/CopyBaseTranslations.cmake b/CMakeModules/CopyBaseTranslations.cmake
index b8b37e46d..bb00d2090 100644
--- a/CMakeModules/CopyBaseTranslations.cmake
+++ b/CMakeModules/CopyBaseTranslations.cmake
@@ -1,3 +1,9 @@
+# SPDX-FileCopyrightText: 2019-2026 Connor McLaughlin <stenzek@gmail.com>
+# SPDX-License-Identifier: CC-BY-NC-ND-4.0 + Packaging Restriction
+#
+# NOTE: In addition to the terms of CC-BY-NC-ND-4.0, you may not use this file to create
+# packages or build recipes without explicit permission from the copyright holder.
+
 function(copy_base_translations target)
   get_target_property(MOC_EXECUTABLE_LOCATION Qt6::moc IMPORTED_LOCATION)
   get_filename_component(QT_BINARY_DIRECTORY "${MOC_EXECUTABLE_LOCATION}" DIRECTORY)
diff --git a/CMakeModules/DuckStationBuildOptions.cmake b/CMakeModules/DuckStationBuildOptions.cmake
index 5329ae848..3504d0338 100644
--- a/CMakeModules/DuckStationBuildOptions.cmake
+++ b/CMakeModules/DuckStationBuildOptions.cmake
@@ -1,3 +1,9 @@
+# SPDX-FileCopyrightText: 2019-2026 Connor McLaughlin <stenzek@gmail.com>
+# SPDX-License-Identifier: CC-BY-NC-ND-4.0 + Packaging Restriction
+#
+# NOTE: In addition to the terms of CC-BY-NC-ND-4.0, you may not use this file to create
+# packages or build recipes without explicit permission from the copyright holder.
+
 # Renderer options.
 option(ENABLE_OPENGL "Build with OpenGL renderer" ON)
 option(ENABLE_VULKAN "Build with Vulkan renderer" ON)
diff --git a/CMakeModules/DuckStationBuildSummary.cmake b/CMakeModules/DuckStationBuildSummary.cmake
index c66ed795f..f3ad0bc51 100644
--- a/CMakeModules/DuckStationBuildSummary.cmake
+++ b/CMakeModules/DuckStationBuildSummary.cmake
@@ -1,3 +1,9 @@
+# SPDX-FileCopyrightText: 2019-2026 Connor McLaughlin <stenzek@gmail.com>
+# SPDX-License-Identifier: CC-BY-NC-ND-4.0 + Packaging Restriction
+#
+# NOTE: In addition to the terms of CC-BY-NC-ND-4.0, you may not use this file to create
+# packages or build recipes without explicit permission from the copyright holder.
+
 message(STATUS "Build Type: ${CMAKE_BUILD_TYPE}")
 string(TOUPPER "${CMAKE_BUILD_TYPE}" CMAKE_BUILD_TYPE_UPPER)
 message(STATUS "C Flags: ${CMAKE_C_FLAGS} ${CMAKE_C_FLAGS_${CMAKE_BUILD_TYPE_UPPER}}")
@@ -59,15 +65,6 @@ No support will be provided, continue at your own risk.
 *********************************************************")
 endif()
 
-if(WIN32)
-  message(WARNING "*************** UNSUPPORTED CONFIGURATION ***************
-You are compiling DuckStation with CMake on Windows.
-It may not even build successfully.
-DuckStation only supports MSBuild on Windows.
-No support will be provided, continue at your own risk.
-*********************************************************")
-endif()
-
 if(CPU_ARCH_X64 AND DISABLE_SSE4)
   message(WARNING "*********************** WARNING ***********************
 SSE4 instructions are disabled. This will result in
diff --git a/CMakeModules/DuckStationCompilerRequirement.cmake b/CMakeModules/DuckStationCompilerRequirement.cmake
index b7fabbf86..54d3b1298 100644
--- a/CMakeModules/DuckStationCompilerRequirement.cmake
+++ b/CMakeModules/DuckStationCompilerRequirement.cmake
@@ -1,3 +1,9 @@
+# SPDX-FileCopyrightText: 2019-2026 Connor McLaughlin <stenzek@gmail.com>
+# SPDX-License-Identifier: CC-BY-NC-ND-4.0 + Packaging Restriction
+#
+# NOTE: In addition to the terms of CC-BY-NC-ND-4.0, you may not use this file to create
+# packages or build recipes without explicit permission from the copyright holder.
+
 # Use C++20.
 set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
diff --git a/CMakeModules/DuckStationDependencies.cmake b/CMakeModules/DuckStationDependencies.cmake
index 52c3831b9..46baaa190 100644
--- a/CMakeModules/DuckStationDependencies.cmake
+++ b/CMakeModules/DuckStationDependencies.cmake
@@ -1,16 +1,11 @@
 # SPDX-FileCopyrightText: 2019-2026 Connor McLaughlin <stenzek@gmail.com>
 # SPDX-License-Identifier: CC-BY-NC-ND-4.0 + Packaging Restriction
+#
+# NOTE: In addition to the terms of CC-BY-NC-ND-4.0, you may not use this file to create
+# packages or build recipes without explicit permission from the copyright holder.
 
 # Get prebuilt dependencies for the current platform and architecture.
-if(WIN32)
-  if (CPU_ARCH_X64)
-    set(DEPS_PATH "${CMAKE_SOURCE_DIR}/dep/prebuilt/windows-x64")
-  elseif(CPU_ARCH_ARM64)
-    set(DEPS_PATH "${CMAKE_SOURCE_DIR}/dep/prebuilt/windows-arm64")
-  else()
-    message(FATAL_ERROR "Unsupported architecture")
-  endif()
-elseif(APPLE)
+if(APPLE)
   set(DEPS_PATH "${CMAKE_SOURCE_DIR}/dep/prebuilt/macos-universal")
 elseif(LINUX)
   if(CMAKE_CROSSCOMPILING)
@@ -43,7 +38,7 @@ set(THREADS_PREFER_PTHREAD_FLAG ON)
 find_package(Threads REQUIRED)
 
 # pkg-config gets pulled transitively on some platforms.
-if(NOT WIN32 AND NOT APPLE)
+if(NOT APPLE)
   find_package(PkgConfig REQUIRED)
   find_package(Libbacktrace REQUIRED)
 endif()
@@ -86,19 +81,8 @@ find_package(spirv_cross_c_shared REQUIRED
 find_package(SDL3 3.4.4 REQUIRED
              NO_DEFAULT_PATH PATHS "${DEPS_PATH}/lib/cmake/SDL3")
 
-# Verify dependency paths.
-foreach(dep zstd WebP PNG libjpeg-turbo freetype harfbuzz plutosvg cpuinfo
-            DiscordRPC SoundTouch libzip Shaderc spirv_cross_c_shared SDL3)
-  if((${dep}_LIBRARY AND NOT "${${dep}_LIBRARY}" MATCHES "^${DEPS_PATH}") OR
-     (${dep}_DIR AND NOT "${${dep}_DIR}" MATCHES "^${DEPS_PATH}"))
-    message(FATAL_ERROR "Using incorrect ${dep} library. Check your dependencies.")
-  endif()
-endforeach()
-
 # All our builds include Qt, so this is not a problem.
 set(QT_NO_PRIVATE_MODULE_WARNING ON)
-
-# Should be prebuilt.
 if(LINUX)
   find_package(Qt6 6.11.1 REQUIRED
                 NO_DEFAULT_PATH PATHS "${DEPS_PATH}/lib/cmake/Qt6"
@@ -109,40 +93,38 @@ else()
                 COMPONENTS Core Gui GuiPrivate Widgets LinguistTools)
 endif()
 
-# Have to verify it down here, don't want users using unpatched Qt.
-if(NOT Qt6_DIR MATCHES "^${DEPS_PATH}")
-message(FATAL_ERROR "Using incorrect Qt library. Check your dependencies.")
-endif()
+# Verify dependency paths.
+foreach(dep zstd WebP PNG libjpeg-turbo freetype harfbuzz plutosvg cpuinfo
+            DiscordRPC SoundTouch libzip Shaderc spirv_cross_c_shared SDL3 Qt6)
+  if((${dep}_LIBRARY AND NOT "${${dep}_LIBRARY}" MATCHES "^${DEPS_PATH}") OR
+     (${dep}_DIR AND NOT "${${dep}_DIR}" MATCHES "^${DEPS_PATH}"))
+    message(FATAL_ERROR "Using incorrect ${dep} library. Check your dependencies.")
+  endif()
+endforeach()
 
 # Libraries that are pulled in from host.
-if(NOT WIN32)
-  find_package(CURL REQUIRED)
-  if(LINUX)
-    find_package(UDEV REQUIRED)
+find_package(CURL REQUIRED)
+if(LINUX)
+  find_package(UDEV REQUIRED)
+endif()
+
+if(NOT APPLE)
+  if(ENABLE_X11)
+    find_package(X11 REQUIRED)
+    if (NOT X11_xcb_FOUND)
+      message(FATAL_ERROR "XCB is required")
+    endif()
   endif()
 
-  if(NOT APPLE)
-    if(ENABLE_X11)
-      find_package(X11 REQUIRED)
-      if (NOT X11_xcb_FOUND)
-        message(FATAL_ERROR "XCB is required")
-      endif()
-    endif()
-
-    if(ENABLE_WAYLAND)
-      find_package(ECM REQUIRED NO_MODULE)
-      list(APPEND CMAKE_MODULE_PATH "${ECM_MODULE_PATH}")
-      find_package(Wayland REQUIRED Egl)
-    endif()
+  if(ENABLE_WAYLAND)
+    find_package(ECM REQUIRED NO_MODULE)
+    list(APPEND CMAKE_MODULE_PATH "${ECM_MODULE_PATH}")
+    find_package(Wayland REQUIRED Egl)
   endif()
 endif()
 
-if(NOT WIN32)
-  find_package(FFMPEG 8.1.1 COMPONENTS avcodec avformat avutil swresample swscale)
-  if(NOT FFMPEG_FOUND)
-    message(WARNING "FFmpeg not found, using bundled headers.")
-  endif()
-endif()
+find_package(FFMPEG 8.1.1 COMPONENTS avcodec avformat avutil swresample swscale)
 if(NOT FFMPEG_FOUND)
+  message(WARNING "FFmpeg not found, using bundled headers.")
   set(FFMPEG_INCLUDE_DIRS "${CMAKE_SOURCE_DIR}/dep/ffmpeg/include")
 endif()
diff --git a/CMakeModules/DuckStationUtils.cmake b/CMakeModules/DuckStationUtils.cmake
index 6d2c8c6d0..e81b42164 100644
--- a/CMakeModules/DuckStationUtils.cmake
+++ b/CMakeModules/DuckStationUtils.cmake
@@ -1,56 +1,52 @@
+# SPDX-FileCopyrightText: 2019-2026 Connor McLaughlin <stenzek@gmail.com>
+# SPDX-License-Identifier: CC-BY-NC-ND-4.0 + Packaging Restriction
+#
+# NOTE: In addition to the terms of CC-BY-NC-ND-4.0, you may not use this file to create
+# packages or build recipes without explicit permission from the copyright holder.
+
 include(CheckSourceCompiles)
 
 function(disable_compiler_warnings_for_target target)
-	if(MSVC)
-		target_compile_options(${target} PRIVATE "/W0")
-	else()
-		target_compile_options(${target} PRIVATE "-w")
-	endif()
+  target_compile_options(${target} PRIVATE "-w")
 endfunction()
 
 function(detect_operating_system)
-	message(STATUS "CMake Version: ${CMAKE_VERSION}")
-	message(STATUS "CMake System Name: ${CMAKE_SYSTEM_NAME}")
+  message(STATUS "CMake Version: ${CMAKE_VERSION}")
+  message(STATUS "CMake System Name: ${CMAKE_SYSTEM_NAME}")
 
-	# LINUX wasn't added until CMake 3.25.
-	if (CMAKE_VERSION VERSION_LESS 3.25.0 AND CMAKE_SYSTEM_NAME MATCHES "Linux")
-		# Have to make it visible in this scope as well for below.
-		set(LINUX TRUE PARENT_SCOPE)
-		set(LINUX TRUE)
-	endif()
+  # LINUX wasn't added until CMake 3.25.
+  if (CMAKE_VERSION VERSION_LESS 3.25.0 AND CMAKE_SYSTEM_NAME MATCHES "Linux")
+    # Have to make it visible in this scope as well for below.
+    set(LINUX TRUE PARENT_SCOPE)
+    set(LINUX TRUE)
+  endif()
 
-	if(WIN32)
-		message(STATUS "Building for Windows.")
-	elseif(APPLE AND NOT IOS)
-		message(STATUS "Building for MacOS.")
-	elseif(LINUX)
-		message(STATUS "Building for Linux.")
-	elseif(BSD)
-		message(STATUS "Building for *BSD.")
-	else()
-		message(FATAL_ERROR "Unsupported platform.")
-	endif()
+  if(WIN32)
+    message(FATAL_ERROR "Building for Windows with CMake is not supported. "
+                        "Open the solution file with Visual Studio.")
+  elseif(APPLE AND NOT IOS)
+    message(STATUS "Building for MacOS.")
+  elseif(LINUX)
+    message(STATUS "Building for Linux.")
+  elseif(BSD)
+    message(STATUS "Building for *BSD.")
+  else()
+    message(FATAL_ERROR "Unsupported platform.")
+  endif()
 endfunction()
 
 function(detect_compiler)
-	if(MSVC AND CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
-		set(COMPILER_CLANG_CL TRUE PARENT_SCOPE)
-		set(IS_SUPPORTED_COMPILER TRUE PARENT_SCOPE)
-		message(STATUS "Building with Clang-CL.")
-	elseif(CMAKE_CXX_COMPILER_ID STREQUAL "Clang" OR CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang")
-		set(COMPILER_CLANG TRUE PARENT_SCOPE)
-		set(IS_SUPPORTED_COMPILER TRUE PARENT_SCOPE)
-		message(STATUS "Building with Clang/LLVM.")
-	elseif(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
-		set(COMPILER_GCC TRUE PARENT_SCOPE)
-		set(IS_SUPPORTED_COMPILER FALSE PARENT_SCOPE)
-		message(STATUS "Building with GNU GCC.")
-	elseif(MSVC)
-		set(IS_SUPPORTED_COMPILER TRUE PARENT_SCOPE)
-		message(STATUS "Building with MSVC.")
-	else()
-		message(FATAL_ERROR "Unknown compiler: ${CMAKE_CXX_COMPILER_ID}")
-	endif()
+    if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang" OR CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang")
+      set(COMPILER_CLANG TRUE PARENT_SCOPE)
+      set(IS_SUPPORTED_COMPILER TRUE PARENT_SCOPE)
+      message(STATUS "Building with Clang/LLVM.")
+    elseif(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
+      set(COMPILER_GCC TRUE PARENT_SCOPE)
+      set(IS_SUPPORTED_COMPILER FALSE PARENT_SCOPE)
+      message(STATUS "Building with GNU GCC.")
+    else()
+      message(FATAL_ERROR "Unknown compiler: ${CMAKE_CXX_COMPILER_ID}")
+    endif()
 endfunction()
 
 function(detect_architecture)
@@ -71,13 +67,9 @@ function(detect_architecture)
          CMAKE_SIZEOF_VOID_P EQUAL 8)
     message(STATUS "Building x86_64 binaries.")
     set(CPU_ARCH_X64 TRUE PARENT_SCOPE)
-    if(NOT MSVC OR CMAKE_CXX_COMPILER_ID STREQUAL "Clang" AND NOT DISABLE_SSE4)
+    if(NOT DISABLE_SSE4)
       set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -msse4.1" PARENT_SCOPE)
       set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -msse4.1" PARENT_SCOPE)
-    elseif(MSVC AND NOT DISABLE_SSE4)
-      # Clang defines these macros, MSVC does not.
-      set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /D__SSE3__ /D__SSE4_1__" PARENT_SCOPE)
-      set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /D__SSE3__ /D__SSE4_1__" PARENT_SCOPE)
     endif()
   elseif(("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "aarch64" OR "${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "arm64") AND
          CMAKE_SIZEOF_VOID_P EQUAL 8) # Might have an A64 kernel, e.g. Raspbian.
diff --git a/dep/CMakeLists.txt b/dep/CMakeLists.txt
index 86d59ab6b..9366feda6 100644
--- a/dep/CMakeLists.txt
+++ b/dep/CMakeLists.txt
@@ -1,3 +1,9 @@
+# SPDX-FileCopyrightText: 2019-2026 Connor McLaughlin <stenzek@gmail.com>
+# SPDX-License-Identifier: CC-BY-NC-ND-4.0 + Packaging Restriction
+#
+# NOTE: In addition to the terms of CC-BY-NC-ND-4.0, you may not use this file to create
+# packages or build recipes without explicit permission from the copyright holder.
+
 set(_saved_CMAKE_MESSAGE_LOG_LEVEL ${CMAKE_MESSAGE_LOG_LEVEL})
 set(CMAKE_MESSAGE_LOG_LEVEL NOTICE)
 
@@ -61,10 +67,4 @@ if(CPU_ARCH_LOONGARCH64)
   disable_compiler_warnings_for_target(lagoon)
 endif()
 
-if(WIN32)
-  add_subdirectory(d3d12ma EXCLUDE_FROM_ALL)
-  disable_compiler_warnings_for_target(d3d12ma)
-  add_subdirectory(winpixeventruntime EXCLUDE_FROM_ALL)
-endif()
-
 set(CMAKE_MESSAGE_LOG_LEVEL ${_saved_CMAKE_MESSAGE_LOG_LEVEL})
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 7dc4ceb41..f85b4d64c 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -4,15 +4,10 @@ add_subdirectory(core)
 add_subdirectory(scmversion)
 add_subdirectory(duckstation-qt)
 
-if(WIN32 OR APPLE)
+if(APPLE)
   add_subdirectory(updater)
 endif()
 
-if(WIN32)
-  add_subdirectory(installer)
-  add_subdirectory(uninstaller)
-endif()
-
 if(BUILD_REGTEST)
   add_subdirectory(duckstation-regtest)
 endif()
diff --git a/src/common-tests/CMakeLists.txt b/src/common-tests/CMakeLists.txt
index 7624bda14..ebd07e84d 100644
--- a/src/common-tests/CMakeLists.txt
+++ b/src/common-tests/CMakeLists.txt
@@ -1,3 +1,9 @@
+# SPDX-FileCopyrightText: 2019-2026 Connor McLaughlin <stenzek@gmail.com>
+# SPDX-License-Identifier: CC-BY-NC-ND-4.0 + Packaging Restriction
+#
+# NOTE: In addition to the terms of CC-BY-NC-ND-4.0, you may not use this file to create
+# packages or build recipes without explicit permission from the copyright holder.
+
 add_executable(common-tests
   binary_reader_writer_tests.cpp
   bitutils_tests.cpp
diff --git a/src/common/CMakeLists.txt b/src/common/CMakeLists.txt
index baee748a4..8d3c6e68c 100644
--- a/src/common/CMakeLists.txt
+++ b/src/common/CMakeLists.txt
@@ -1,3 +1,9 @@
+# SPDX-FileCopyrightText: 2019-2026 Connor McLaughlin <stenzek@gmail.com>
+# SPDX-License-Identifier: CC-BY-NC-ND-4.0 + Packaging Restriction
+#
+# NOTE: In addition to the terms of CC-BY-NC-ND-4.0, you may not use this file to create
+# packages or build recipes without explicit permission from the copyright holder.
+
 add_library(common
   align.h
   assert.cpp
@@ -81,26 +87,6 @@ target_include_directories(common PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}/..")
 target_link_libraries(common PUBLIC fmt Threads::Threads)
 target_link_libraries(common PRIVATE fast_float "${CMAKE_DL_LIBS}")
 
-if(WIN32)
-  target_sources(common PRIVATE
-    thirdparty/StackWalker.cpp
-    thirdparty/StackWalker.h
-    windows_headers.h
-  )
-  target_link_libraries(common PRIVATE OneCore.lib)
-endif()
-
-if(MSVC)
-  if(CPU_ARCH_X64)
-    enable_language(ASM_MASM)
-    target_sources(common PRIVATE fastjmp_x86.asm)
-    set_source_files_properties(fastjmp_x86.asm PROPERTIES COMPILE_FLAGS "/D_M_X86_64")
-  elseif(CPU_ARCH_ARM32 OR CPU_ARCH_ARM64)
-    enable_language(ASM_MARMASM)
-    target_sources(common PRIVATE fastjmp_arm.asm)
-  endif()
-endif()
-
 if(APPLE)
   set(MAC_SOURCES
     cocoa_tools.h
@@ -113,7 +99,7 @@ if(APPLE)
   target_link_libraries(common PRIVATE ${COCOA_LIBRARY} ${QUARTZCORE_LIBRARY})
 endif()
 
-if(NOT WIN32 AND NOT ANDROID AND NOT APPLE)
+if(NOT ANDROID AND NOT APPLE)
   target_link_libraries(common PRIVATE libbacktrace::libbacktrace)
 endif()
 
diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index ca5e678af..7124c2de8 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -1,3 +1,9 @@
+# SPDX-FileCopyrightText: 2019-2026 Connor McLaughlin <stenzek@gmail.com>
+# SPDX-License-Identifier: CC-BY-NC-ND-4.0 + Packaging Restriction
+#
+# NOTE: In addition to the terms of CC-BY-NC-ND-4.0, you may not use this file to create
+# packages or build recipes without explicit permission from the copyright holder.
+
 add_library(core
   achievements.cpp
   achievements.h
diff --git a/src/duckstation-qt/CMakeLists.txt b/src/duckstation-qt/CMakeLists.txt
index 069f3301d..18627c0bb 100644
--- a/src/duckstation-qt/CMakeLists.txt
+++ b/src/duckstation-qt/CMakeLists.txt
@@ -1,3 +1,9 @@
+# SPDX-FileCopyrightText: 2019-2026 Connor McLaughlin <stenzek@gmail.com>
+# SPDX-License-Identifier: CC-BY-NC-ND-4.0 + Packaging Restriction
+#
+# NOTE: In addition to the terms of CC-BY-NC-ND-4.0, you may not use this file to create
+# packages or build recipes without explicit permission from the copyright holder.
+
 include(CopyBaseTranslations)
 
 set(CMAKE_AUTOUIC OFF)
@@ -215,58 +221,7 @@ qt_wrap_ui(UI_SRCS SOURCES ${UI_FILES})
 target_sources(duckstation-qt PRIVATE ${UI_SRCS})
 target_include_directories(duckstation-qt PRIVATE "$<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}>")
 
-if(WIN32)
-  target_sources(duckstation-qt PRIVATE
-    duckstation-qt.manifest
-    duckstation-qt.rc
-    vcruntimecheck.cpp
-  )
-
-  # Needed to enable RAIntegration.
-  target_link_libraries(duckstation-qt PRIVATE rcheevos)
-
-  # We want a Windows subsystem application not console.
-  set_target_properties(duckstation-qt PROPERTIES
-    WIN32_EXECUTABLE TRUE
-    DEBUG_POSTFIX "-debug")
-
-  # Copy in Qt DLLs. Borrowed from Dolphin.
-  get_target_property(MOC_EXECUTABLE_LOCATION Qt6::moc IMPORTED_LOCATION)
-  get_filename_component(QT_BINARY_DIRECTORY "${MOC_EXECUTABLE_LOCATION}" DIRECTORY)
-  find_program(WINDEPLOYQT_EXE windeployqt HINTS "${QT_BINARY_DIRECTORY}")
-  add_custom_command(TARGET duckstation-qt POST_BUILD
-    COMMAND "${CMAKE_COMMAND}" -E env PATH="${QT_BINARY_DIRECTORY}"
-            "${WINDEPLOYQT_EXE}" --libdir="${CMAKE_RUNTIME_OUTPUT_DIRECTORY}"
-                                 --plugindir="${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/QtPlugins"
-                                 $<IF:$<CONFIG:Debug>,--debug,--release>
-                                 --no-compiler-runtime
-                                 --no-system-d3d-compiler
-                                 --no-system-dxc-compiler
-                                 --no-translations
-                                 "$<TARGET_FILE:duckstation-qt>"
-  )
-  add_custom_command(TARGET duckstation-qt POST_BUILD
-    COMMAND ${CMAKE_COMMAND} -E copy_if_different "${CMAKE_CURRENT_SOURCE_DIR}/qt.conf.win" "${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/qt.conf"
-  )
-  #set_source_files_properties(${TS_FILES} PROPERTIES OUTPUT_LOCATION "${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/translations")
-
-  set(DEPS_TO_COPY cpuinfo.dll discord-rpc.dll dxcompiler.dll dxil.dll freetype.dll harfbuzz.dll jpeg62.dll libpng16.dll
-                   libsharpyuv.dll libwebp.dll libwebpdemux.dll libwebpmux.dll plutosvg.dll SDL3.dll shaderc_shared.dll
-                   soundtouch.dll spirv-cross-c-shared.dll zip.dll zlib1.dll zstd.dll)
-  foreach(DEP ${DEPS_TO_COPY})
-    list(APPEND DEP_BINS "${CMAKE_PREFIX_PATH}/bin/${DEP}")
-  endforeach()
-  add_custom_command(TARGET duckstation-qt POST_BUILD
-    COMMAND ${CMAKE_COMMAND} -E copy_if_different ${DEP_BINS} "${CMAKE_RUNTIME_OUTPUT_DIRECTORY}"
-  )
-  if(CMAKE_BUILD_TYPE MATCHES "Debug|Devel")
-    get_property(WINPIXEVENTRUNTIME_DLL TARGET WinPixEventRuntime::WinPixEventRuntime PROPERTY IMPORTED_LOCATION)
-    message(STATUS WP "${WINPIXEVENTRUNTIME_DLL}")
-    add_custom_command(TARGET duckstation-qt POST_BUILD
-      COMMAND ${CMAKE_COMMAND} -E copy_if_different "${WINPIXEVENTRUNTIME_DLL}" "${CMAKE_RUNTIME_OUTPUT_DIRECTORY}"
-    )
-  endif()
-elseif(APPLE)
+if(APPLE)
   # Don't generate a bundle for XCode, it makes code signing fail...
   get_scm_version()
   set(BUNDLE_PATH ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/DuckStation.app)
diff --git a/src/duckstation-regtest/CMakeLists.txt b/src/duckstation-regtest/CMakeLists.txt
index 7c95983b8..9a7080255 100644
--- a/src/duckstation-regtest/CMakeLists.txt
+++ b/src/duckstation-regtest/CMakeLists.txt
@@ -1,3 +1,9 @@
+# SPDX-FileCopyrightText: 2019-2026 Connor McLaughlin <stenzek@gmail.com>
+# SPDX-License-Identifier: CC-BY-NC-ND-4.0 + Packaging Restriction
+#
+# NOTE: In addition to the terms of CC-BY-NC-ND-4.0, you may not use this file to create
+# packages or build recipes without explicit permission from the copyright holder.
+
 add_executable(duckstation-regtest
   regtest_host.cpp
 )
diff --git a/src/installer/CMakeLists.txt b/src/installer/CMakeLists.txt
deleted file mode 100644
index 914e1c8e5..000000000
--- a/src/installer/CMakeLists.txt
+++ /dev/null
@@ -1,21 +0,0 @@
-add_executable(installer
-  installer.cpp
-  installer.h
-  installer.manifest
-  installer.rc
-  installer_params.h
-  installer_ui.cpp
-  installer_ui.h
-  resource.h
-  ../updater/updater_progress_callback.h
-  ../updater/win32_progress_callback.cpp
-  ../updater/win32_progress_callback.h
-  ../updater/win32_window_util.cpp
-  ../updater/win32_window_util.h
-  ../duckstation-qt/vcruntimecheck.cpp
-)
-
-target_include_directories(installer PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}/..")
-target_link_libraries(installer PRIVATE common fmt lzma)
-target_link_libraries(installer PRIVATE "Comctl32.lib")
-set_target_properties(installer PROPERTIES WIN32_EXECUTABLE TRUE)
diff --git a/src/scmversion/CMakeLists.txt b/src/scmversion/CMakeLists.txt
index dca122d21..7d8509b2a 100644
--- a/src/scmversion/CMakeLists.txt
+++ b/src/scmversion/CMakeLists.txt
@@ -1,16 +1,14 @@
-if(CMAKE_HOST_SYSTEM MATCHES "Windows")
-  add_custom_target(generate_scmversion
-                    COMMAND cmd /k "${CMAKE_CURRENT_SOURCE_DIR}/gen_scmversion.bat"
-                    WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}"
-                    BYPRODUCTS "${CMAKE_CURRENT_BINARY_DIR}/scmversion.cpp"
-                    COMMENT "Checking if scmversion.cpp needs to be updated")
-else()
-  add_custom_target(generate_scmversion
-                    COMMAND "${CMAKE_CURRENT_SOURCE_DIR}/gen_scmversion.sh"
-                    WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}"
-                    BYPRODUCTS "${CMAKE_CURRENT_BINARY_DIR}/scmversion.cpp"
-                    COMMENT "Checking if scmversion.cpp needs to be updated")
-endif()
+# SPDX-FileCopyrightText: 2019-2026 Connor McLaughlin <stenzek@gmail.com>
+# SPDX-License-Identifier: CC-BY-NC-ND-4.0 + Packaging Restriction
+#
+# NOTE: In addition to the terms of CC-BY-NC-ND-4.0, you may not use this file to create
+# packages or build recipes without explicit permission from the copyright holder.
+
+add_custom_target(generate_scmversion
+                  COMMAND "${CMAKE_CURRENT_SOURCE_DIR}/gen_scmversion.sh"
+                  WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}"
+                  BYPRODUCTS "${CMAKE_CURRENT_BINARY_DIR}/scmversion.cpp"
+                  COMMENT "Checking if scmversion.cpp needs to be updated")
 
 add_library(scmversion
   "${CMAKE_CURRENT_BINARY_DIR}/scmversion.cpp"
diff --git a/src/uninstaller/CMakeLists.txt b/src/uninstaller/CMakeLists.txt
deleted file mode 100644
index 218504c56..000000000
--- a/src/uninstaller/CMakeLists.txt
+++ /dev/null
@@ -1,11 +0,0 @@
-add_executable(uninstaller
-  main.cpp
-  resource.h
-  uninstaller.manifest
-  uninstaller.rc
-)
-
-target_include_directories(uninstaller PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}/..")
-target_link_libraries(uninstaller PRIVATE common fmt)
-target_link_libraries(uninstaller PRIVATE "Comctl32.lib")
-set_target_properties(uninstaller PROPERTIES WIN32_EXECUTABLE TRUE)
diff --git a/src/updater/CMakeLists.txt b/src/updater/CMakeLists.txt
index cfcf97cb0..af2d4ead7 100644
--- a/src/updater/CMakeLists.txt
+++ b/src/updater/CMakeLists.txt
@@ -1,3 +1,9 @@
+# SPDX-FileCopyrightText: 2019-2026 Connor McLaughlin <stenzek@gmail.com>
+# SPDX-License-Identifier: CC-BY-NC-ND-4.0 + Packaging Restriction
+#
+# NOTE: In addition to the terms of CC-BY-NC-ND-4.0, you may not use this file to create
+# packages or build recipes without explicit permission from the copyright holder.
+
 add_executable(updater
   updater.cpp
   updater.h
@@ -6,23 +12,6 @@ add_executable(updater
 target_include_directories(updater PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}/..")
 target_link_libraries(updater PRIVATE common minizip ZLIB::ZLIB)
 
-if(WIN32)
-  target_sources(updater PRIVATE
-    resource.h
-    updater.manifest
-    updater.rc
-    updater_progress_callback.h
-    win32_main.cpp
-    win32_progress_callback.cpp
-    win32_progress_callback.h
-    win32_window_util.cpp
-    win32_window_util.h
-    ../duckstation-qt/vcruntimecheck.cpp
-  )
-  target_link_libraries(updater PRIVATE "Comctl32.lib")
-  set_target_properties(updater PROPERTIES WIN32_EXECUTABLE TRUE)
-endif()
-
 if(APPLE)
   set(MAC_SOURCES
     cocoa_main.mm
diff --git a/src/util-tests/CMakeLists.txt b/src/util-tests/CMakeLists.txt
index e3deb9bd9..27df4a764 100644
--- a/src/util-tests/CMakeLists.txt
+++ b/src/util-tests/CMakeLists.txt
@@ -1,3 +1,9 @@
+# SPDX-FileCopyrightText: 2019-2026 Connor McLaughlin <stenzek@gmail.com>
+# SPDX-License-Identifier: CC-BY-NC-ND-4.0 + Packaging Restriction
+#
+# NOTE: In addition to the terms of CC-BY-NC-ND-4.0, you may not use this file to create
+# packages or build recipes without explicit permission from the copyright holder.
+
 add_executable(util-tests
   animated_image_tests.cpp
   elf_parser_tests.cpp
diff --git a/src/util/CMakeLists.txt b/src/util/CMakeLists.txt
index e82131a19..8ecac0340 100644
--- a/src/util/CMakeLists.txt
+++ b/src/util/CMakeLists.txt
@@ -1,3 +1,9 @@
+# SPDX-FileCopyrightText: 2019-2026 Connor McLaughlin <stenzek@gmail.com>
+# SPDX-License-Identifier: CC-BY-NC-ND-4.0 + Packaging Restriction
+#
+# NOTE: In addition to the terms of CC-BY-NC-ND-4.0, you may not use this file to create
+# packages or build recipes without explicit permission from the copyright holder.
+
 add_library(util
   animated_image.cpp
   animated_image.h
@@ -124,13 +130,6 @@ if(ENABLE_OPENGL)
   target_compile_definitions(util PUBLIC "ENABLE_OPENGL=1")
   target_link_libraries(util PRIVATE glad)
 
-  if(WIN32)
-    target_sources(util PRIVATE
-      opengl_context_wgl.cpp
-      opengl_context_wgl.h
-    )
-  endif()
-
   if(LINUX OR BSD OR ANDROID)
     target_sources(util PRIVATE
       opengl_context_egl.cpp
@@ -215,46 +214,7 @@ if(NOT ANDROID)
   target_include_directories(util PUBLIC ${FFMPEG_INCLUDE_DIRS})
 endif()
 
-if(WIN32)
-  target_sources(util PRIVATE
-    d3d_common.cpp
-    d3d_common.h
-    d3d11_device.cpp
-    d3d11_device.h
-    d3d11_pipeline.cpp
-    d3d11_pipeline.h
-    d3d11_stream_buffer.cpp
-    d3d11_stream_buffer.h
-    d3d11_texture.cpp
-    d3d11_texture.h
-    d3d12_builders.cpp
-    d3d12_builders.h
-    d3d12_descriptor_heap_manager.cpp
-    d3d12_descriptor_heap_manager.h
-    d3d12_device.cpp
-    d3d12_device.h
-    d3d12_pipeline.cpp
-    d3d12_pipeline.h
-    d3d12_stream_buffer.cpp
-    d3d12_stream_buffer.h
-    d3d12_texture.cpp
-    d3d12_texture.h
-    dinput_source.cpp
-    dinput_source.h
-    http_downloader_winhttp.cpp
-    win32_raw_input_source.cpp
-    win32_raw_input_source.h
-    xaudio2_audio_stream.cpp
-    xinput_source.cpp
-    xinput_source.h
-  )
-  target_link_libraries(util PRIVATE d3d12ma)
-  target_link_libraries(util PRIVATE Cfgmgr32.lib Dwmapi.lib winhttp.lib)
-
-  if(CMAKE_BUILD_TYPE MATCHES "Debug|Devel")
-    target_link_libraries(util PRIVATE WinPixEventRuntime::WinPixEventRuntime)
-  endif()
-elseif(APPLE)
+if(APPLE)
   set(MAC_SOURCES
     metal_device.h
     metal_device.mm
@@ -277,7 +237,7 @@ elseif(NOT ANDROID)
   endif()
 endif()
 
-if(NOT WIN32 AND NOT ANDROID)
+if(NOT ANDROID)
   target_sources(util PRIVATE
     http_downloader_curl.cpp
   )