You probably want something like 
use strict;
use warnings;
my $FILE = undef;
my $filename = 'C:\tmp\blah.txt';
open( $FILE, '<', $filename ) or die "Can't open $filename: $!";
while(<$FILE>) {
  ...
}
close $FILE or die "Close failed";

[download]
See perlopentut for more.

Also, it looks like you are running Win32. /tmp/blah.txt is not a proper Win32 filename.

Update: Thanks to cdarke for pointing out Win32 filename subtleties, where /tmp/blah.txt indeed is a possibly filename.

--
Andreas

In reply to Re^3: Where did I go wrong? by andreas1234567
in thread Where did I go wrong? by sjlo

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