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How to use NSWorkspace to be able to open a filetype? - Cocoa
#import <Cocoa/Cocoa.h>

@interface fileClickerAppDelegate : NSObject <NSApplicationDelegate> {
NSWindow *window;
NSTextField *fileName;
}

@property (assign) IBOutlet NSWindow *window;
@property (assign) IBOutlet NSTextField *fileName;

@end

#import "fileClickerAppDelegate.h"

@implementation fileClickerAppDelegate

@synthesize window;
@synthesize fileName;

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {

}

- (void)application:(NSApplication *)theApplication openFiles:(NSArray *)filenames {

    [fileName setStringValue:[NSString stringWithFormat:@"Wow, even multiple files like %d :-)", [filenames count]]];
}

@end