Default Windows Mobile Media Player to “Storage Card”
I use WMMP every day on the drive to work, and one of my pet peeves is that every morning I have to manually select “Storage Card’ to point it to my music. This trick (which simply removes the Device library), solves that problem!
Mobile Windows Media Player, when launched, defaults to showing the “My Device” library. You probably want it to open the “Storage Card” library by default. You can remove the “My Device” library listing option completely by deleting the following file: “Mobile Device\Application Data\Microsoft\Media Player\XMEMediaLibrary.mlb.” This way, only the files in your Storage Card library will show up in Windows Media Player Mobile.
Source: pocketnow