I'd like to ask a technology-based linguistics question, but I don't know where to ask it.
Which is grammatically correct? 'a .exe file' or 'an .exe file'?
It's a question about grammar. It doesn't matter if it mentions executable files, rockets, pets, or marshmallows.
It would be off-topic on Super User, since it's not related to a software/hardware issue.
Linguistics is more about language theory in general, not about specific English grammar questions.