[ANN] Amnesia: The Dark Descent - Custom Story Installation Creator

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English is the only supported language at this time.
I may incorporate multi-lingual support.

Comparing against a regex like "extra_[a-z]+\.lang" should do it.

It should already, unless your Steam is not installed correctly.
What's your OS?

I tested the program in Windows 7. My Steam installion, however, is located on a different hard drive. So if you claim it should have Steam support, it would appear you're not checking the Windows registry for Steam installations. And if that's the case, then the same would be for retail edition of Amnesia. (This assuming the registry even contains install locations for these things.)

Not sure what you mean, because custom_story_settings.cfg and language files must be placed in the root of the custom story to be found by the game. And those files are the only ones the program cares about.

The CFG and LANG, however, people place in the correct spot. Custom entities, static objects, etc, they tend to have scattered all over. In which case, a more abstract way of listing files for archiving would be practical.