MCD File Type -- By default, the MCD file will have a common file type extension (e.g., PU1 or TAP). It is possible to override this system default by entering a file type for this post only. For merging post with multiple GPost runs, only the final MCD file created by Merge GPost will have this new file type. The intermediate MCD files will have *.PUn as the file type. (Intcom 4600) (Intcom 4601 - 4606 for extension lettering)