Use a replacement selector for Windows support.

neoform/src/main/java/net/neoforged/gradle/neoform/naming/NeoFormOfficialNamingChannelConfigurator.java

@@ -215,7 +215,7 @@ public abstract static class MappingsFileValueSource implements ValueSource<File
         @Nullable
         @Override
         public File obtain() {
-            return getParameters().getNeoFormArchive().filter(f -> f.getAbsoluteFile().getPath().endsWith(getParameters().getMappingsFilePath().get())).getSingleFile();
+            return getParameters().getNeoFormArchive().filter(f -> f.getAbsoluteFile().getPath().replace(File.separator, "/").endsWith(getParameters().getMappingsFilePath().get())).getSingleFile();
         }
     }
 }