Question Cant see all my files & folders on LAN network.

Did a factory reset on my Tab 10.1 tablet and reinstalled File Manager to browse network and also BS Player to stream videos.

I have my wifi LAN network connected and am able to view files & folder on my PC and stream videos from my PC to Android.

However, not ALL of my folders and video files in my shared pc folders are being displayed.
For example only some of the .mp4 files will show up in LAN mode, while others will not. The same with .avi files.

The folders that ARE displayed are able to be opened and have files viewed & opened.
The video files that ARE displayed play/stream fine.

All files & folders are viewable on my S3 in both apps

Any suggestions as to why some files won't show up?
I believe it is mostly my newer files & folders