Questions abt data files

I do have a couple of questions abt moving data files

I have lots of daily TV shows on my Mac, so was trying to just use shared folders to access this data (until I get the new drive above)
I have shared the folder on the Mac and added the folder in Mezzmo, all the files appear and look perfect (all avi files) in the desktop app.
However when I try to play them on my Samsung BD-E6100 I get a message that the file format is not supported on my TV
The files are fine, if I copy them locally they work fine, if I transcode them they work fine
Am I expected to much here, with data moving between 2 computers and then to the TV?
This is only a minor inconvenience as I can easily force transcode everything new, but wondering if the above should work

If the Mezzmo media server is running as a Windows service it may not have permissions to access the files, you can try setting the server to run as a Windows Console process in 'Media Server Settings' in Mezzmo or change the service in Windows services to run under your user account instead of as the Local System user.