diff --git a/MatchUtil.cs b/MatchUtil.cs
index 38563a8..fc910b7 100644
--- a/MatchUtil.cs
+++ b/MatchUtil.cs
@@ -1,4 +1,6 @@
+#if NET40_OR_GREATER || NETCOREAPP
 using System.Collections.Concurrent;
+#endif
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
@@ -20,7 +22,11 @@ namespace SabreTools.Matching
         /// <param name="matchers">Enumerable of ContentMatchSets to be run on the file</param>
         /// <param name="includeDebug">True to include positional data, false otherwise</param>
         /// <returns>List of strings representing the matched protections, null or empty otherwise</returns>
+#if NET35
+        public static Queue<string>? GetAllMatches(string file, byte[]? stack, IEnumerable<ContentMatchSet>? matchers, bool includeDebug = false)
+#else
         public static ConcurrentQueue<string>? GetAllMatches(string file, byte[]? stack, IEnumerable<ContentMatchSet>? matchers, bool includeDebug = false)
+#endif
         {
             return FindAllMatches(file, stack, matchers, includeDebug, false);
         }
@@ -51,14 +57,22 @@ namespace SabreTools.Matching
         /// <param name="includeDebug">True to include positional data, false otherwise</param>
         /// <param name="stopAfterFirst">True to stop after the first match, false otherwise</param>
         /// <returns>List of strings representing the matched protections, null or empty otherwise</returns>
+#if NET35
+        private static Queue<string>? FindAllMatches(string file, byte[]? stack, IEnumerable<ContentMatchSet>? matchers, bool includeDebug, bool stopAfterFirst)
+#else
         private static ConcurrentQueue<string>? FindAllMatches(string file, byte[]? stack, IEnumerable<ContentMatchSet>? matchers, bool includeDebug, bool stopAfterFirst)
+#endif
         {
             // If there's no mappings, we can't match
             if (matchers == null || !matchers.Any())
                 return null;
 
             // Initialize the queue of matched protections
+#if NET35
+            var matchedProtections = new Queue<string>();
+#else
             var matchedProtections = new ConcurrentQueue<string>();
+#endif
 
             // Loop through and try everything otherwise
             foreach (var matcher in matchers)
@@ -75,7 +89,7 @@ namespace SabreTools.Matching
                 {
                     positionStrs.Add(pos.ToString());
                 }
-                string positionsString = string.Join(", ", positionStrs.ToArray());
+                string positionsString = string.Join(", ", [.. positionStrs]);
 #else
                 string positionsString = string.Join(", ", positions);
 #endif
@@ -117,7 +131,11 @@ namespace SabreTools.Matching
         /// <param name="matchers">Enumerable of ContentMatchSets to be run on the file</param>
         /// <param name="includeDebug">True to include positional data, false otherwise</param>
         /// <returns>List of strings representing the matched protections, null or empty otherwise</returns>
+#if NET35
+        public static Queue<string>? GetAllMatches(string file, Stream? stack, IEnumerable<ContentMatchSet>? matchers, bool includeDebug = false)
+#else
         public static ConcurrentQueue<string>? GetAllMatches(string file, Stream? stack, IEnumerable<ContentMatchSet>? matchers, bool includeDebug = false)
+#endif
         {
             return FindAllMatches(file, stack, matchers, includeDebug, false);
         }
@@ -148,14 +166,22 @@ namespace SabreTools.Matching
         /// <param name="includeDebug">True to include positional data, false otherwise</param>
         /// <param name="stopAfterFirst">True to stop after the first match, false otherwise</param>
         /// <returns>List of strings representing the matched protections, null or empty otherwise</returns>
+#if NET35
+        private static Queue<string>? FindAllMatches(string file, Stream? stack, IEnumerable<ContentMatchSet>? matchers, bool includeDebug, bool stopAfterFirst)
+#else
         private static ConcurrentQueue<string>? FindAllMatches(string file, Stream? stack, IEnumerable<ContentMatchSet>? matchers, bool includeDebug, bool stopAfterFirst)
+#endif
         {
             // If there's no mappings, we can't match
             if (matchers == null || !matchers.Any())
                 return null;
 
             // Initialize the queue of matched protections
+#if NET35
+            var matchedProtections = new Queue<string>();
+#else
             var matchedProtections = new ConcurrentQueue<string>();
+#endif
 
             // Loop through and try everything otherwise
             foreach (var matcher in matchers)
@@ -172,7 +198,7 @@ namespace SabreTools.Matching
                 {
                     positionStrs.Add(pos.ToString());
                 }
-                string positionsString = string.Join(", ", positionStrs.ToArray());
+                string positionsString = string.Join(", ", [.. positionStrs]);
 #else
                 string positionsString = string.Join(", ", positions);
 #endif
@@ -213,7 +239,11 @@ namespace SabreTools.Matching
         /// <param name="matchers">Enumerable of PathMatchSets to be run on the file</param>
         /// <param name="any">True if any path match is a success, false if all have to match</param>
         /// <returns>List of strings representing the matched protections, null or empty otherwise</returns>
+#if NET35
+        public static Queue<string> GetAllMatches(string file, IEnumerable<PathMatchSet>? matchers, bool any = false)
+#else
         public static ConcurrentQueue<string> GetAllMatches(string file, IEnumerable<PathMatchSet>? matchers, bool any = false)
+#endif
         {
             return FindAllMatches(new List<string> { file }, matchers, any, false);
         }
@@ -225,7 +255,11 @@ namespace SabreTools.Matching
         /// <param name="matchers">Enumerable of PathMatchSets to be run on the file</param>
         /// <param name="any">True if any path match is a success, false if all have to match</param>
         /// <returns>List of strings representing the matched protections, null or empty otherwise</returns>
+#if NET35
+        public static Queue<string> GetAllMatches(IEnumerable<string>? files, IEnumerable<PathMatchSet>? matchers, bool any = false)
+#else
         public static ConcurrentQueue<string> GetAllMatches(IEnumerable<string>? files, IEnumerable<PathMatchSet>? matchers, bool any = false)
+#endif
         {
             return FindAllMatches(files, matchers, any, false);
         }
@@ -270,21 +304,29 @@ namespace SabreTools.Matching
         /// <param name="any">True if any path match is a success, false if all have to match</param>
         /// <param name="stopAfterFirst">True to stop after the first match, false otherwise</param>
         /// <returns>List of strings representing the matched protections, null or empty otherwise</returns>
+#if NET35
+        private static Queue<string> FindAllMatches(IEnumerable<string>? files, IEnumerable<PathMatchSet>? matchers, bool any, bool stopAfterFirst)
+#else
         private static ConcurrentQueue<string> FindAllMatches(IEnumerable<string>? files, IEnumerable<PathMatchSet>? matchers, bool any, bool stopAfterFirst)
+#endif
         {
             // If there's no mappings, we can't match
             if (matchers == null || !matchers.Any())
-                return new ConcurrentQueue<string>();
+                return new();
 
             // Initialize the list of matched protections
+#if NET35
+            var matchedProtections = new Queue<string>();
+#else
             var matchedProtections = new ConcurrentQueue<string>();
+#endif
 
             // Loop through and try everything otherwise
             foreach (var matcher in matchers)
             {
                 // Determine if the matcher passes
                 bool passes;
-                var firstMatchedString = string.Empty;
+                string? firstMatchedString;
                 if (any)
                 {
                     (bool anyPasses, var matchedString) = matcher.MatchesAny(files);
diff --git a/SabreTools.Matching.csproj b/SabreTools.Matching.csproj
index 3bce46c..9a69395 100644
--- a/SabreTools.Matching.csproj
+++ b/SabreTools.Matching.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <!-- Assembly Properties -->
-    <TargetFrameworks>net40;net452;net462;net472;net48;netcoreapp3.1;net5.0;net6.0;net7.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>net35;net40;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>
     <LangVersion>latest</LangVersion>
     <Nullable>enable</Nullable>
@@ -26,6 +26,9 @@
   </ItemGroup>
 
   <!-- Support for old .NET versions -->
+  <ItemGroup Condition="$(TargetFramework.StartsWith(`net3`))">
+    <PackageReference Include="ValueTupleBridge" Version="0.1.5" />
+  </ItemGroup>
   <ItemGroup Condition="$(TargetFramework.StartsWith(`net4`))">
     <PackageReference Include="System.ValueTuple" Version="4.5.0" />
   </ItemGroup>