I was just writing an email asking a supervisor about downloading multiple dynamic-link library files. The acronym for these is DLL, and the full spelling, dynamic-link library, is never used. How would this be pluralized, because normally I would just add an s, but DLLs is difficult to understand. Sometimes I add an apostrophe to make it DLL's, but I know this isn't grammatically correct. So my question is, how do I make the acronym DLL (and acronyms in general) plural?
"DLLs" is fine. Just capitalize the acronym (it's actually an initialism which makes capitalization even more appropriate/necessary) but leave the plural letters lowercase.
When I reffer to .dll files (or any file extension), I usually add "files" after to avoid confusion as to what a .dll is.
And I add a period before because .dll is a file type.
Just my own convention that works for me.