system() and system_exec() failing on CGI for certain commands

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Hi. I have a program that converts mp3 audio to wave files. I am trying to
invoke it from a CGI program. The file is on my PATH variable, and the program is
called abcaudio.exe. When I do system_exec("abcaudio input_file.mp3
output_file.wav", 2), nothing happens, but system_exec returns -1. When I enter
the same commands when not in a CGI script everything works well. What's
happening and how can I fix this? Thanks to all of you who have and are helping
us out here! I greatly appreciate it!

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