Per MSDN (emphasis mine, extra text omitted):
Do not use the following reserved names for the name of a file:
CON, [...]. Also avoid these names followed immediately by an extension[...].
I suggest renaming the con language to something like connive. A bit longer, but still alphabetically appropriate and will not cause issues for students trying to interact with the languages on Windows.
Per MSDN (emphasis mine, extra text omitted):
I suggest renaming the
conlanguage to something likeconnive. A bit longer, but still alphabetically appropriate and will not cause issues for students trying to interact with the languages on Windows.