On your Droid 3 connected over WiFi to Windows XP:
1. Select "Files" to launch the File Manger.
2. Select +Add Server
3. Select [an IP Address or simply select] "Scan for server"
4. You should now see a folder indicating something like "Unknown Group"
5. Select this or some other legitimate named group.
6. You should now see the IP address of your PC. Select it.
7. If you see "Logon Failure -- Re-enter authentication info" click OK.
8. Type User name "Guest" AND Password "Guest" (not case sensitive).
9. You should now see every folder on your PC incl. Printers.
10. You can only access shared folders, but you can still see all devices.
11. Navigate to C:\Documents and Settings\All Users\Documents.
(For XP)
On your XP PC:
1. Place .apk, .mp4, .mp3, etc. files into:
C:\Documents and Settings\All Users\Documents
Click on any file and it will load up wireless.
One caveat I noticed was that the entire file must load first, so no streaming.
This is great way to grab .apk files for developers.
H.