The games Pirate and Gun fail because John must have unzipped them with the Windows version of unzip instead of unzip for the QL. This causes the executables' QDOS headers to be lost. Breakout fails because it tries to load a file named 'mc', but there is no file with such a name in the mgames.zip archive on Dilwyn's web site.
Dilwyn, is one or more of the original files missing from mgames.zip? John, I can send you by email a version of mgames.zip correctly unzipped for the QL. (But breakout seems to be missing.) Daniele