I tried this in several possible settings, with different locations of the script itself, different paths to the executable, including the one you specified, and they all worked fine for, both with and without the "C:" in the path to the executable.

However, I tried it with a different executable, as I don't have the tkwarn.exe - I had it open my editpad. So all I can imagine is that the error message your getting is actually an error from tkwarn.exe and not from the script itself.

Update: All this was on a W2k box, with ActiveState 5.6.1.

--cs

This may or may not help. Time is late. Don't hold it against me.