I understand the process to be a headache. You will need software updates from Yamaha that allow you to put the MCX in transfer mode...there are other packages on the market but I understand they can brick your MCX1000.

-call/email Yamaha tech support for info
-check out AVS forums (networking, media servers, streaming forum) search MCX1000
-take the MCX1000 to a local Yamaha dealer and see if they can transfer the files...I have heard that there is a charge for this.

Nonetheless, the process can be performed and it is SLOW. Best of luck.