I installed an Xbox 360 disc on the USB stick as a backup. Is it possible to move the backup to the PC using Horizon?

Horizon recognizes the installed disc. I try to extract it to the PC, but this error message appears:

(What is written in Portuguese translated into English is more or less like this: Object reference not set to an object instance.)

So I ask, is what I’m trying to do possible? If so, how do I fix this error?