diff --git a/tools/vslol/LolFxLanguageService.cs b/tools/vslol/LolFxLanguageService.cs
index efb4b1ec..a7d5002e 100644
--- a/tools/vslol/LolFxLanguageService.cs
+++ b/tools/vslol/LolFxLanguageService.cs
@@ -25,7 +25,7 @@ class LolFxLanguageService : LanguageService
 {
     public override string GetFormatFilterList()
     {
-        throw new NotImplementedException();
+        return "LolFx files (*.lolfx)\n*.lolfx\n";
     }
 
     public override LanguagePreferences GetLanguagePreferences()