Hi!
Maybe I found the solution:
1. Go in Girder and create a new command
2. Select the TAB "
Command"
3. Choose the action "
Right Click"
4. Select target with
Class Name = BSPlayer and
Executable = BSPLAYER.EXE and press OK (CHECK ONLY THIS TWO ITEMS)
5. In TAB "
Command" put
WParam = 2 and
LParam = 100000
6. Press Apply
This way it works even if BSplayer is not the foreground window.
I don't know exactly how LParam works, but it's linked to the position where the menu popups. With value=100000 the menu popups in top-left corner of the BSplayer skin.
If you want it to popups in a different position, try using the "Capture" button in the "Command" TAB and make some tests.
For example with a value=3604686 it popups in center of Base skin.
Bye and let me know if t worked!!
Why the upload doesn't function anymore??? 
Only few users were able to upload files... Maybe the only user in the last months was RafkeP
Please fix this issue... :)
Note: I'm not screaming, only made it more visible