> > error output > IOError: [Errno 2] No such file or directory:"filename.exe -type png > -source sourcearg -file filename.png"
Use 'os.system' not 'execfile'. 'execfile' is for executing other python scripts, not arbitrary command line. Try this: import os ... ... os.system("filename.exe -type png -source sourcearg -file filename.png") > try > execfile("d:\pathto\filename.exe -type png -source sourcearg -file > filename.png") > > error output > IOError: [Errno 2] No such file or directory:"d:\pathto\filename.exe > filename.exe -type png -source sourcearg -file filename.png" be careful with your '\'s they tend to get interpreted as escape characters. You can prefix the string with an 'r', double them up or use forward slashes. One of the following should work: r"d:\pathto\filename.exe -type png -source sourcearg -file filename.png" "d:\\pathto\\filename.exe -type png -source sourcearg -file filename.png" "d:/pathto/filename.exe -type png -source sourcearg -file filename.png" -- http://mail.python.org/mailman/listinfo/python-list