Hi Joe H,
I wasn't suggesting using Musicsoft Downloader to actually transfer any files, but only to check if you can see the folder structure of the User drive, which I thought you might be interested in.
The attached screenshot from the program shows the drives on my T4 with the USER drive selected and the SYSTEM folder within it expanded to show the files in it. At the moment these consist of some .PLL (audio song playlists), .eff (User Effects files) and a .msu (User MIDI template).
BTW you can copy and paste any unprotected files to and from drives on the keyboard to ones on your computer! You don't have to use the program's 'MOVE' function! You simply highlight the file/s in the source folder and right click. A small options box opens in which you can select 'Copy'. You then select the destination folder, on your computer for example, then right click again and the 'Paste' option is available.
I think that some older versions of the program when used with some keyboards did not have this function.
Although I don't use the program myself routinely, it's worth having a copy around if you want to see an overview of the whole keyboard. It even includes any external USB drives connected at the time.