Have you set your target to workshop? you can't upload .exe's , html5 or other extentions, i think.

EDIT: So, i was wrong on this one...

Originally posted by Fight and Dead:

Have you set your target to workshop? you can't upload .exe's , html5 or other extentions, i think.:SocialPolicy:

of course I have

Then you have something in your code for a specific extension. Try to remove that code. http://bugs.yoyogames.com/view.php?id=7043 for a better explanation.

Originally posted by Fight and Dead:

Have you set your target to workshop? you can't upload .exe's , html5 or other extentions, i think.:SocialPolicy:

I think what you are describing are file extensions. File extensions and GameMaker extensions are completely different things. An extension in GameMaker adds actions, events, and code that you can use. They have all different sorts of uses that existing actions/code can't do alone, and they're made by the community.

As for why you can't use them, it's probably a matter of security. Since you can make a custom action perform malicious activity, they'd rather you just don't put them in.