Example: Cocoa launch application via path.

cocoa_launchApp.m

+ (void) launchApp:(NSString *)path {
    NSURL *url = [NSURL fileURLWithPath:path];
    
    NSError *err = nil;
    if ([url checkResourceIsReachableAndReturnError:&err]) {
        [[NSWorkspace sharedWorkspace] launchApplication:[url path]];
    } else {
        NSLog(@"%@", [err localizedDescription]);
    }
}