Ok, i know this must be straight forward!
I am running the latest version of mame and open the command prompt and type the following to create the listxml.
d:\mame\mamepp.exe -listxml
Now it goes through all the roms, but does not produce an output - am I missing something from the end of the command line?
Have tried searching but cannot seem to find the answer

The reason I want to create the list is to try jcrouse cpviewer.
Thanks