You're completely right when the path originated not from the actual os.
In that case I'd probably do it a bit primitive like that: 
($progname = "c:\\foo\\bar\\basename") =~ s!^.*[\\/]!!;
warn $progname;

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pelagic

In reply to Re^3: use File::Basename - need to specify OS? by pelagic
in thread use File::Basename - need to specify OS? by kiat

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