This is a brief KB regarding how to Export video from an Express or HD Express to play in Windows Media Player. ( VLC etc not required )
This will only work using iPIMS. ( export from the Express units will NOT play in Windows Media player )
Install IPIMS, connect to Express or HD Express, Setup iPIMS for viewing then playback.
Select a camera, Backup Start / End Time, Camera. Backup, Destination.
Browse to folder then copy the " cameraname-xx.avi " to any windows machine.
This export will play directly in Windows Media Player.
Below is a screen that shows IPIMS Backup, playback of Cam7 , the Backup util ,
the " Cam7 2017-08-15....avi " file and Windows Media Player playing the AVI.

IPIMS download found here: