Right, you can use Windows Media Player 12 and it works, it is very easy and Windows 7 help system walks you through it. It does not want to transcode though (that means letting your Evoke Flow play files it usually can't by converting them on the fly). So, no playing your OGGs and FLACs on the Evoke that way. If you just use AACs, MP3s and WMAs then this may be fine for you though.
If you need to transcode, download Serviio as recommended by someone on this forum. Get it here:http://www.serviio.org/
Now to use this, follow these steps:
1) Give your Evoke a static IP address. Serviio won't recognise the Evoke, not a problem but it means it will need to be sure of the Evoke's IP address on your network every time you use it to apply the correct transcode profile. Most routers can reserve an IP address for a specific MAC code (your Evoke's hardware id is it's MAC code) with a simple setting in the router options. If yours can't then you need to set up your Evoke with a fixed IP address. This is beyond the scope of this post, but your router manual (and the Evoke manual as well if you need a fixed IP) can give full details.
2) Install Serviio. When it's installed, go to where you installed Serviio on your disk and go to the '/Serviio/config' folder. Edit the file 'profiles.xml' in Notepad and insert the following to the end of the file just before the final '</Profiles>' line:
<Profile id="14" name="Pure EVOKE Flow" extendsProfileId="1">
<Matches container="lpcm" />
<Matches container="flac" />
<Matches container="ogg" />
3) Restart your PC. there should now be a Serviio icon in your system tray. Use this to start the Serviio console. Select Media Server on your Evoke's menu and choose the Serviio server. On your PC, refresh the renderer profiles on the Serviio console's status tab and you should see an 'unrecognized device' on the IP your Evoke is on. Choose the 'Pure EVOKE Flow' profile for that device and hit save. On the Library tab you can choose the folder that holds your music and tick the box next to it to tell Serviio that it's a music folder. Save again. Make sure transcoding is enabled on the Transcoding tab and downmix to stereo. On the Presentation tab disable Image and Video catagories and set 'Audio' to 'Display Content Only' but leave the individual categories as 'Display Category'. Save.
You can now select the Serviio server on your Evoke and all your Flac and Ogg files will play fine, as well as the MP3s and other files the Evoke can play natively.