Well I looked at it quite a bit, not sure why it was ever called unfoldarea since it actually loads an area.
There are a lot of problems with it right off, but the only way it should have crashed was if there was an area format issue.
It would shutdown if you tried it on an area already loaded though.
It also would put $ for the filename on the area you just loaded instead of the right filename.
It didn't check to see if the area was already loaded (duplicate vnums would cause it to exit).
It would allow like unfoldarea ../player/r/Remcon (Would exit the mud since it didn't find #AREA).
Think that was the only problems I ran into and have been addressed for the next release.
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Remcon
Lands of Pabulum