Re: Before uploading my module...

[strat]

I'd set the filehandle to binmode to make it work under Win32 as well, slurp the file, and use open with three params to prevent filenames like ">xyz.jpg" (but well, you caught that in the -e $filename), e.g:

unless( open( my $fh, '<', $cache ) ) {
    warn "Thumbnail.pm: $! opening $cache\n";
}
else {
    local $/;
    binmode $fh;
    print <$fh>;
};