If I were doing something like this, I'd try and make my module try a number of tricks rather than only one.
- Look for recent data file from CPAN ala brian_d_foy's response above
- Failing that, try previous known-good file names
- Failing that, try guessing at file names based on any patterns you've recognised
- Failing that, ask the user
This way, you have the known-good option first, but you also have a few fallbacks so users have some recourse if they're cut off from CPAN or you die in a car crash and can't update the file, or whatever.
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