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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Sanitizing file names?
Date: Wed, 11 Sep 2024 05:27:25 +0300
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> From: Christopher Howard <christopher@librehacker.com>
> Date: Tue, 10 Sep 2024 12:09:50 -0800
> 
> Hi, does Emacs/Elisp have any kind of API to help with sanitizing file names for the underlying OS/file-system limitations? Some of my projects involve older Windows systems that won't allow various characters in the file name like question marks and colons.

Is convert-standard-filename what you want?