Serviio downloading file, not streaming

I set the server up at a friends house. He has 2 computers each running W8, 64 bit. He ios using GOM to play the videos. When we tried to play a video file from the server on the client PC it downloaded the file instead of streaming like I expected. I'm sure there is a simple setting but I searched and couldn't find it. I would appreciate any help. TIA

ShofB

[zip]

It is basically a download server, similar to downloading a file from a website. So the client needs to know to start playing it instead of downloading.