winerror.h
The closest I can find is ERROR_TIMEOUT which has a value of 1460. Unfortunately the Windows implementation of Perl does not allow return codes > 255 from a process (because of Perl's UNIX history).

In reply to Re^3: Killing a process on Windows (Win32::Process question) by cdarke
in thread Killing a process on Windows (Win32::Process question) by rovf

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