I did a quick look and coulding find this answered anywhere....
If I add two "post build" steps (just two lines of file-copy's), my build fails (CVI 8.0). The batch file that CVI creates puts a CR, but no LF, between the two lines that were added in the text box, causing the command interpreter to try to run it as a single command. I can get around it for now by creating an external batch fall and calling it from the CVI post-build-actions, but I thought I'd mention it so maybe it would get fixed in the next release.