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Error: Case mismatch between module and file name

Windows uses case-insensitive filesystems. It is often possible to misspell a module name and still have Perl load the correct file. For example:

use Win32::Eventlog;

...loads the Win32::EventLog module, but it does not import any symbols from it: Perl tries to call the Win32::Eventlog->import() method, which doesn't exist, and gives up. PerlSvc on Windows generates an error when the file name and the module name cases don't match:

Win32\Eventlog.pm:
error: Case mismatch between module and file name
file: C:\perl\site\lib\Win32\EventLog.pm
auto\Win32\Eventlog\Eventlog.dll:
error: Case mismatch between module and file name
file: C:\perl\site\lib\auto\Win32\EventLog\EventLog.dll

http://docs.activestate.com/pdk/9.0/PerlSvc.html