Hi,
I can include support for a filename without extension, but I don't know what is the problem since when you manually set it with the {ask} parameter, it does not compile?
Twistpad simply launch's the selected tool with the selected parameter, it does not edit or read any eventual Environment Variables.
I can assist you on further inquires you may have regarding this problem, so it can be fixed, maybe a change Dir is required?
Thanks,
André Santos Carthago Software Support
http://www.carthagosoft.net