Keeping in mind that this golf challenge asks for a program rather than a subroutine... :)
48 characters:
#!perl
$m=pop;for$"(pop..$m){$_="@ARGV";-e||warn"$_\n"}
example usage: perl missing.pl bar .jpg 0000 0050
Hurrah for the range operator and magical auto-increment!
As best I can figure it, the only way to accurately accomplish the bonus (checking for a comparison string that's too big) is to check all the files in the directory. Otherwise there could be one file in there with a unique part of the right length.
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