You're using quotes where you don't need to, and as indicated above, the single-quotes in the open statement are not only unnecessary, but cause the "file not found" error. Try it like this:
die "$file not found\n" unless ( -e $file );
open( FH0, $file ) or die "Unable to open $file: $!\n";
In that version, I took advantage of the fact that "open" assumes "for reading" as a default; if the file name returns "true" with '-e', then it exists. But there might still be issues with being able to read it. If '-r' returns true for the file, then it's virtually certain that "open" for reading will succeed.
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