It looks like Peter missed them in the manual. There are three relevant functions: get-open-file, get-save-file, and choose-directory. They all create modal dialogs that let the user select a file to open, save, or select a directory.
Thanks you. They're just what I needed. I've released cl-cbr 003, a cbr viewer that uses ltk. It's at https://sourceforge.net/project/showfiles.php?group_id=145920
As you can see for the version number, it's just at the beginning, but works. It needs unrar and imagemagick. It's installable with asdf, but I don't know what to do to be installable via internet.
Bye!
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