diff --git a/OSBindings/Mac/Clock Signal/Info.plist b/OSBindings/Mac/Clock Signal/Info.plist
index cb3dbb978..20b8c8b80 100644
--- a/OSBindings/Mac/Clock Signal/Info.plist	
+++ b/OSBindings/Mac/Clock Signal/Info.plist	
@@ -173,6 +173,21 @@
 			<key>NSDocumentClass</key>
 			<string>$(PRODUCT_MODULE_NAME).MachineDocument</string>
 		</dict>
+		<dict>
+			<key>CFBundleTypeExtensions</key>
+			<array>
+				<string>p</string>
+				<string>81</string>
+			</array>
+			<key>CFBundleTypeIconFile</key>
+			<string>cassette</string>
+			<key>CFBundleTypeName</key>
+			<string>ZX81 Tape Image</string>
+			<key>CFBundleTypeRole</key>
+			<string>Viewer</string>
+			<key>NSDocumentClass</key>
+			<string>MachineDocument</string>
+		</dict>
 	</array>
 	<key>CFBundleExecutable</key>
 	<string>$(EXECUTABLE_NAME)</string>