Most applications, but I don't know details about MS Works, keep their Most Recently Used information in the registry. If you see the whole 'path' it's quite recognizable. For example, HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Excel\Recent Files contains the recent filelist of MS Excel. Easy to delete entries with regedit.
Use regedit to search for the filename in HKEY_CURRENT_USER and delete it (or change it to a non-existing file).
That's what I would do.
In microsoft works word processor in the file drop down menu are two .wps entries i would like to remove them from the drop down menu.
I found something called microsoft works task launcher.There is a clear history button,will this do it or cause problems.