perl will tell you what it thinks the problem is if you add or die $! on to the end of your open statements:

open(FH,">>$file")            or die $!;
open(FH,">>c:\\logfile.log")  or die $!;
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If they don't help you sort out your problem, you will have to show us some more code before we can help you further

PS

wrapping your code in <code> ... </code> tags will format it just like mine above.