Open external application from acrobat

Hi everyone.
I have been looking for a way to open an external app from acrobat because i need to change some values in the regedit.
I have been searching the forums and all i could find was "Dont even think about it".
But the trick is to use app.launchURL. It wouldn't allow you to open exe files but u can just create a new filetype that acts like an exe file, then its possible!
My code looks like this
app.launchURL("c:\ja.hede", true);
I just took the exe i needed and renamed it.
I hope this can some ppl with the same problem as i had
Regards Soren