file_name() returns unknown in im_file in Windows

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mitchfloresswi

NXLOG version: NXLog CE 3.0.2272

OS version: Windows 2019 server

Issue: file_name() returns "unknown" in im_file module

Config:

<Input in_AppABC>
  Module im_file
  <Exec>
	log_info('Filename is' + file_name());
  </Exec>
  File "C:\logs\AppABC.log"
</Input>