Setting default application for given file extension on Mac OS X from code

Question

I have the list of the applications for given file extension (using LSCopyApplicationURLsForURL). I want to change the default file association from code upon selecting one

Answer 1

Here’s a slightly modified and ARC-compliant version of Guillaume’s solution:

#import 

@interface LaunchServicesWrapper : NSObject

+ (BOOL)setMyselfAsDefaultApplicationForFileExtension:
  (NSString *)fileExtension;

@end


#import 
#import "LaunchServicesWrapper.h"

@implementation LaunchServicesWrapper

+ (NSString *)UTIforFileExtension:(NSString *)extension
{
  return (NSString *)CFBridgingRelease(
    UTTypeCreatePreferredIdentifierForTag(
      kUTTagClassFilenameExtension, (__bridge CFStringRef)extension,
      NULL
    )
  );
}

+ (BOOL)setMyselfAsDefaultApplicationForFileExtension:
  (NSString *)fileExtension
{
  return LSSetDefaultRoleHandlerForContentType(
    (__bridge CFStringRef) [LaunchServicesWrapper
    UTIforFileExtension:fileExtension], kLSRolesAll,
    (__bridge CFStringRef) [[NSBundle mainBundle]
    bundleIdentifier]
  );
}

@end