@@ -316,10 +316,31 @@
 		[ret makeImmutable];
 
 		return ret;
 	}
 }
+
+- (OFString *)stringByAppendingPathExtension: (OFString *)extension
+{
+	if ([self hasSuffix: @"\\"] || [self hasSuffix: @"/"]) {
+		void *pool = objc_autoreleasePoolPush();
+		OFMutableArray *components;
+		OFString *fileName, *ret;
+
+		components =
+		    [[self.pathComponents mutableCopy] autorelease];
+		fileName = [components.lastObject
+		    stringByAppendingFormat: @".%@", extension];
+		[components replaceObjectAtIndex: components.count - 1
+				      withObject: fileName];
+
+		ret = [[OFString pathWithComponents: components] retain];
+		objc_autoreleasePoolPop(pool);
+		return [ret autorelease];
+	} else
+		return [self stringByAppendingFormat: @".%@", extension];
+}
 
 - (bool)of_isDirectoryPath
 {
 	return ([self hasSuffix: @"\\"] || [self hasSuffix: @"/"] ||
 	    [OFFileURLHandler of_directoryExistsAtPath: self]);