$TempPath = $ENV{TMP} | $ENV{TEMP} | "$ENV{SYSTEMROOT}.\TEMP";
You want logical-or ("||") not bitwise-or ("|"). 
$TempPath = $ENV{TMP} || $ENV{TEMP} || "$ENV{SYSTEMROOT}.\TEMP";

[download]

See perlop for the reasons why.

In reply to Re: Best way to find Environment TEMP by FunkyMonk
in thread Best way to find Environment TEMP by coldmiser

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