diff --git a/Wabbajack.Common/Paths.cs b/Wabbajack.Common/Paths.cs
index dcc9ba05..f657947c 100644
--- a/Wabbajack.Common/Paths.cs
+++ b/Wabbajack.Common/Paths.cs
@@ -164,8 +164,7 @@ namespace Wabbajack.Common
 
         public static bool operator ==(Extension a, Extension b)
         {
-            // Super fast comparison because extensions are interned
-            return ReferenceEquals(a._extension, b._extension);
+            return string.Equals(a._extension, b._extension, StringComparison.CurrentCultureIgnoreCase);
         }
 
         public static bool operator !=(Extension a, Extension b)
diff --git a/Wabbajack.Test/SanityTests.cs b/Wabbajack.Test/SanityTests.cs
index 157b2a52..895dc4c0 100644
--- a/Wabbajack.Test/SanityTests.cs
+++ b/Wabbajack.Test/SanityTests.cs
@@ -42,6 +42,25 @@ namespace Wabbajack.Test
             await utils.VerifyInstalledFile(mod, @"Data\scripts\test.pex");
         }
         
+        [Fact]
+        public async Task TestCacheFileAreIgnored() 
+        {
+
+            var profile = utils.AddProfile();
+            var mod = await utils.AddMod();
+            var testCache = await utils.AddModFile(mod, @"Data\scripts\test.cache", 10);
+            var testPex = await utils.AddModFile(mod, @"Data\scripts\test.pex", 10);
+
+            await utils.Configure();
+
+            await utils.AddManualDownload(
+                new Dictionary<string, byte[]> {{"/baz/biz.pex", await testPex.ReadAllBytesAsync()}});
+
+            await CompileAndInstall(profile);
+
+            await utils.VerifyInstalledFile(mod, @"Data\scripts\test.pex");
+        }
+        
         [Fact]
         public async Task ExtraFilesInDownloadFolderDontStopCompilation() 
         {