diff --git a/ArcFormats/PkWare/ArcZIP.cs b/ArcFormats/PkWare/ArcZIP.cs
index 44edcea5..3ca5edc3 100644
--- a/ArcFormats/PkWare/ArcZIP.cs
+++ b/ArcFormats/PkWare/ArcZIP.cs
@@ -103,6 +103,7 @@ namespace GameRes.Formats.PkWare
         public ZipOpener ()
         {
             Settings = new[] { ZipEncoding };
+            Extensions = new string[] { "zip", "vndat" };
         }
 
         EncodingSetting ZipEncoding = new EncodingSetting ("ZIPEncodingCP");