Win32::StrictFileNames does that 
$ perl -Mcgi -e 1

$ perl -Mwin32::strictfileNames -e 1

$ perl -Mwin32::strictfileNames -Mcgi -e 1
Can't locate cgi.pm in @INC (@INC contains:...

$ perl -Mwin32::strictfileNames  -Mcgi -e 1
Can't locate cgi.pm in @INC (@INC contains:...

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In reply to Re^2: [Win32] Verify filename (case sensitively) by Anonymous Monk
in thread [Win32] Verify filename (case sensitively) by syphilis

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