nnheader-file-name-translation-alist

nnheader-file-name-translation-alist is a variable defined in `nnheader.el'.
Its value is

nil

Documentation:
*Alist that says how to translate characters in file names.
For instance, if ":" is invalid as a file character in file names
on your system, you could say something like:

(setq nnheader-file-name-translation-alist '((?: . ?_)))