A quick glance at the code of PDF::API2::PDF::Dict reveiled the following snippet:

my $temp_dir = -d '/tmp' ? '/tmp' : $ENV{TMP} || $ENV{TEMP};
$tempbase = sprintf("%s/%d-%d-0000", $temp_dir, $$, time());
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Since you're trying to use it under a Windows machine, you should either set the environment setting TMP or TEMP to avoid the warning.

Hope it helps,

-- JaWi

"A chicken is an egg's way of producing more eggs."