Attempted to use GmatFileUtil::GetFileListFromDirectory(const std::string &dirName, bool addPath) on a win64 machine. Function took inputs and correctly splits the path name from the file extension, but then skips all #if def blocks and goes straight to the function return. Function is not currently used in GMAT, but is desired for development of additional features by the Nav team.
Solution has been found, change function as follows:
Change will be added and committed shortly. Ticket can be closed.