macOS How Can I Read a File With a Relative Path Name

- (void) drawRect:(NSRect)dirtyRect {
	NSString *directory = @".";
	directory = [directory stringByStandardizingPath];
	NSString *fileName = @"/Logo.png";
	NSString *string = [NSString stringWithFormat:@"%@%@%@", @"file://localhost/", directory, fileName];
	NSURL *url = [[NSURL alloc] initWithString:string];
	NSData *data = [NSData dataWithContentsOfURL:url]; <<< data is nil <<<

- (void) drawRect:(NSRect)dirtyRect {
	NSString *path = @"./Preferences/Logo.png";
	NSData *data = [NSData dataWithContentsOfFile:path];
	NSImage *image = [[NSImage alloc] initWithData:data];
	[self setImage:image];
	[super drawRect:dirtyRect];
}

@end

	NSBundle *mainBundle = [NSBundle mainBundle];  // <<<<< works in debug mode, but returns nil in release mode