Exit Code 0

[rese_support]

Every time when I run modtran, modo says "Program terminated with exit code 0." 
What does it mean? How can I solve the problem. 
And why modo always attempts to overwrite input tape 5 and 7 files even when I just use a demo tape5 without modification?

This message is related to the Windows OS and cannot be overriden. Error code 0 means, that no error occured, so your outputs should be alright.
I think, in newer Windows versions, the message no longer appears.