The *.MID files here in the VG-99 and VB-99 patch areas are NOT MIDI files.
These files do not "play" MIDI tunes in a media player.
Rather these *.MID files are
VG-99 and VB-99 patches in
SMF format which must be used with the appropriate Roland VG-99 or VB-99 Editor application to load into your target Roland Processor.
VG-99 PATCH SUBMISSION FORMAT.SAVE ALL YOUR CURRENT PATCHES PRIOR TO USING OTHER PEOPLES VG-99 PATCHES!
( I use the Roland VG-99 Librarian for this task.)
When sharing VG-99 Patches with others, there are known issues and hurdles. The Native VG-99 Editor Patch File format is the ( *.g9e) file format.
The problem is these patch files have embedded ALL User System configuration settings - (GK Sensitivity, MIDI Channels, USB audio I / O routing, etc) which tend to clobber the casual user's VG-99 System settings in a negative manner. Hours can be wasted trying to debug "what broke - all I did was load a VG-99 Patch I found on the net" and I lost all my settings !; ("
Instead - we use the VG-99 Editor's SMF Export / Import function - and save Only the PATCH data and share these as "*.mid" SMF MIDI files.

Develop your patch with the Roland VG-99 Editor, and then save it using the File, Export to SMF, and select PATCH info only. ( Not PATCH+SYSTEM!)
Selecting PATCH keeps other folks getting clobbered with all your System settings.
Enter a Name for your Patch in the message box - like "Rock12.mid"
Please submit Patches here and state the details.
example
PATCH NAME: Surf Verb Strat
Version: 1.00
Category: Clean
Style: Rock
Description: Clean Neck+Middle PU Strat, thru Twin with Spring Reverb, good for surf!
FileType: mid
Keywords: So others can locate your patch, enter typical search words separated by a comma - like this:
Adrian, Belew, Big, Electric, Cat, Foxxtone
To Load patches you find here , From the VG-99 Editor use the Import SMF Command: Reads files saved on the computer in SMF format (.mid).
Also be aware I have seen many Macs with Safari - that will throw all downloaded *.mid files into the Itunes folder - ( OSX thinks these are MIDI Music files) - in general they tend to get lost in the abyss of the OSX hard drive. - and never found again - so pay attention to where you are downloading these - use Firefox Browser and gain more control on where your downloads go on your hard drive.
We are gathering info to create FAQS for performing VG-99 Full Backup / Restore, and a separate FAQ for how to use the VG-99 Librarian.
Fastest way to Learn - Watch this Video
How to use VG-99 Librarian to back up everything!
http://www.vguitarforums.com/smf/index.php?topic=34.0