diff --git a/CHANGELIST.md b/CHANGELIST.md
index f4c18df5..cf196118 100644
--- a/CHANGELIST.md
+++ b/CHANGELIST.md
@@ -6,6 +6,7 @@
 - Support ancient .NET in Core
 - Support ancient .NET in UI Core
 - Support C# 12 syntax
+- Support ancient .NET in Check
 
 ### 3.0.0 (2023-11-14)
 
diff --git a/MPF.Check/MPF.Check.csproj b/MPF.Check/MPF.Check.csproj
index 691e64a8..03b23ef8 100644
--- a/MPF.Check/MPF.Check.csproj
+++ b/MPF.Check/MPF.Check.csproj
@@ -1,15 +1,24 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net6.0;net8.0</TargetFrameworks>
-    <RuntimeIdentifiers>win-x64;linux-x64;osx-x64</RuntimeIdentifiers>
+    <!-- Assembly Properties -->
+    <TargetFrameworks>net452;net462;net472;net48;netcoreapp3.1;net5.0;net6.0;net7.0;net8.0</TargetFrameworks>
+    <RuntimeIdentifiers>win-x86;win-x64;win-arm64;linux-x64;linux-arm64;osx-x64;osx-arm64</RuntimeIdentifiers>
     <OutputType>Exe</OutputType>
+    <LangVersion>latest</LangVersion>
     <Nullable>enable</Nullable>
-    <Title>MPF Check</Title>
-    <Description>Validator for various dumping programs</Description>
-    <Authors>Matt Nadareski;ReignStumble;Jakz</Authors>
-    <Copyright>Copyright (c)2019-2023</Copyright>
+    <SuppressTfmSupportBuildWarnings>true</SuppressTfmSupportBuildWarnings>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <VersionPrefix>3.0.0</VersionPrefix>
+
+    <!-- Package Properties -->
+    <Title>MPF Check</Title>
+    <Authors>Matt Nadareski;ReignStumble;Jakz</Authors>
+    <Description>Validator for various dumping programs</Description>
+    <Copyright>Copyright (c) Matt Nadareski 2019-2023</Copyright>
+    <PackageProjectUrl>https://github.com/SabreTools/</PackageProjectUrl>
+    <RepositoryUrl>https://github.com/SabreTools/MPF</RepositoryUrl>
+    <RepositoryType>git</RepositoryType>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/MPF.Check/Program.cs b/MPF.Check/Program.cs
index c43458cd..6fb549e2 100644
--- a/MPF.Check/Program.cs
+++ b/MPF.Check/Program.cs
@@ -45,7 +45,11 @@ namespace MPF.Check
             protectionProgress.ProgressChanged += ConsoleLogger.ProgressUpdated;
 
             // Validate the supplied credentials
+#if NETFRAMEWORK
+            (bool? _, string? message) = RedumpWebClient.ValidateCredentials(options.RedumpUsername ?? string.Empty, options.RedumpPassword ?? string.Empty);
+#else
             (bool? _, string? message) = RedumpHttpClient.ValidateCredentials(options.RedumpUsername ?? string.Empty, options.RedumpPassword ?? string.Empty).ConfigureAwait(false).GetAwaiter().GetResult();
+#endif
             if (!string.IsNullOrWhiteSpace(message))
                 Console.WriteLine(message);
 
@@ -65,7 +69,7 @@ namespace MPF.Check
                 // Now populate an environment
                 Drive? drive = null;
                 if (!string.IsNullOrWhiteSpace(path))
-                    drive = Drive.Create(null, path);
+                    drive = Drive.Create(null, path!);
 
                 var env = new DumpEnvironment(options, filepath, drive, knownSystem, mediaType, internalProgram: null, parameters: null);