More workarounds for the UTI bugs

Cocoa/Document.m

@@ -2785,4 +2785,15 @@ enum GBWindowResizeAction
     [self queueDebuggerCommand:sender.alternateTitle];
 }
 
++ (NSArray<NSString *> *)readableTypes
+{
+    NSMutableSet *set = [NSMutableSet setWithArray:[super readableTypes]];
+    for (NSString *type in @[@"gb", @"gbc", @"isx", @"gbs"]) {
+        [set addObject:(__bridge_transfer NSString *)UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension,
+                                                                                           (__bridge CFStringRef)type,
+                                                                                           NULL)];
+    }
+    return [set allObjects];
+}
+
 @end

Cocoa/Info.plist

@@ -22,7 +22,8 @@
 			<key>LSItemContentTypes</key>
 			<array>
 				<string>com.github.liji32.sameboy.gb</string>
-                <string>public.gbrom</string>
+				<string>public.gbrom</string>
+				<string>com.retroarch.gb</string>
 			</array>
 			<key>LSTypeIsPackage</key>
 			<integer>0</integer>
@@ -43,6 +44,7 @@
 			<key>LSItemContentTypes</key>
 			<array>
 				<string>com.github.liji32.sameboy.gbc</string>
+				<string>com.retroarch.gbc</string>
 			</array>
 			<key>LSTypeIsPackage</key>
 			<integer>0</integer>