diff --git a/cmake-proxies/cmake-modules/MacOSXBundleInfo.plist.in b/cmake-proxies/cmake-modules/MacOSXBundleInfo.plist.in
index 1467e0f11..9200468e0 100644
--- a/cmake-proxies/cmake-modules/MacOSXBundleInfo.plist.in
+++ b/cmake-proxies/cmake-modules/MacOSXBundleInfo.plist.in
@@ -9,6 +9,7 @@
 		<dict>
 			<key>CFBundleTypeExtensions</key>
 			<array>
+				<string>aup3</string>
 				<string>aup</string>
 			</array>
 			<key>CFBundleTypeIconFile</key>