Is your C program giving an absolute path to LoadLibrary? If not, then the process's exe's dir is searched, then PATH is searched. See http://msdn.microsoft.com/en-us/library/windows/desktop/ms684175%28v=vs.85%29.aspx. What else from the .pm runs during your require call? Did something do local(%ENV)?

In reply to Re^5: Win32 Perl fail to see the set ENV in loaded module by bulk88
in thread Win32 Perl fail to see the set ENV in loaded module by kartlee05

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