set a mark in an arbitrary file

Is there a way to set a mark to a file not loaded in a buffer, just
specified by the filename?

I keep losing my (uppercase) marks, and would like to set them up in
my .vimrc. I'd do this using setpos(), but that requires a buffer
number. I want to call something like setpos("'A", ['filename.c', 1,
1, 0]).

Thanks,
Sam

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