I'm always sending one file to a device.
The device is always the same and the file has the same path and name.
How do I write a batch file to do this?
For Widcomm stack you shoud try
C:\Program Files\Widcomm\Bluetooth Software\btsendto_explorer.exe" -BD_ADDR=
For Microsoft stack try this: http://www.newlc.com/topic-9327
Please excuse for this half answer, but I don't have my batch file for Widcomm at hand and I still recall how much trouble I went to 2 years ago trying to find the correct command line parameters.
You can contact me through my website if you succeed or if I should dig for the batch file :D
If this is for a Bluetooth enable phone then you could use CECopy from the Windows Mobile PowerToys.
See this link http://forums.thoughtsmedia.com/f96/copy-files-mobile-device-easily-14037.html for details of how to install / use it for creating new 'Send To' links - but the command lines should work as part of a batch script also ...
I'm not sure if it will work for other bluetooth devices ??