TCStartPath and 4StartPath refer to the location of TCSTART.BTM and TCEXIT.BTM files. "C:\" seems like a very unlikely location for those files. Are you possibly confusing this with the current directory when TCC starts? The directory in which TCC starts can be specified in a shortcut or on TCC's command line. It can also be specified in the TCSTART.BTM file but that can cause problems when transient (pipe) instances of TCC unknowingly have their current directory changed.