When you do not explicitly open the files by name, but simply start using <>, you are reading a catenation of all of the files on the command line. Therefore, the first time through the loop, you read all of the files. As the link implied, $ARGV refers to whatever file <> is currently referencing (the last one). If you want it to work as you intend, you could do something like:
foreach my $file (@ARGV)
open (FILE, $file) || die "could not open $file";
print "whatever you wanted to use as a separator $file\n";
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