Allow me to point out some places of improvement:

• to see if a string ends in something, you must anchor it with \z, \Z, or $
• match what you need; this is wasteful: /.*\.foo$/
• using /i is sometimes wasteful, especially for a few characters

That said, I offer:

my @files = map s/\.[Rr][Aa][Mm]$// ? $_ : (), readdir DH;
[download]

Maybe you think those character classes look ugly, and maybe the difference is minimal, but in a case like this, I think it's a wise investment. Also, you may wish to use a different ending anchor in place of $.

japhy -- Perl and Regex Hacker

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