> I think if you compile with SYMBOLS = 1 uncommented in makefile, you will get that. I > have no idea what it is for.
The reason it is put in the main binary releases is to assist those who download only the binary from MAMEDEV to be able to contribute useful information if a crash happens (Access Violation message) when you get taken out of MAME and back to command-prompt. It may or may not be in future releases. It will do nothing if you do not care about reasons for a crash and you wish to delete it.