Even if your phone does not support file browsing, you may still be able to send files from the 770 to the phone.

If the phone and 770 are paired, the phone will appear in the File Manager. Pick a file you want to send to the phone, and just drag it to the phone's icon.

This worked for me to download a .sis app via my 770 and send it to my N-GageQD, even though the N-GageQD does not support file browsing.