I want to be able to execute BTM files, but with an extension of .tc instead of .btm, under XP/Vista. I tried associating the ".tc" with "%COMSPEC /i /d /c", but I get an endless loop of tcc subshells, never any output from the script. Yes, the script works fine as a .btm, just to intercept that question :-) I also tried the "set .tc=%COMSPEC" method, same result. Without either of the two above, Windows will prompt me to find the program needed to execute .tc files. Any ideas?