With MS-BASIC on CP/M, if you saved the file using lowercase, BASIC would not upshift it, and the CPP commands could not act of the resulting files. You’d have

With MS-BASIC on CP/M, if you saved the file using lowercase, BASIC would not upshift it, and the CPP commands could not act of the resulting files. You’d have to fix it by removing the file within BASIC using the built in command (KILL I think) then saving it in uppercase. Can’t say MS considered it a bug or simply chose to not fix it for backward compatibility. It existed in quite late versions.