Volumio in VM freebox delta

I want to put volumio on my freebox as a virtual machine. I think I can but I don’t know how. With freebox interface, I can mount a system with an image but only .iso is supported. So I try to convert .img file into .iso with OSFmount but installation doesn’t work.
I try it with raspberry file and windows x86 file without success…
Did I make a mistake - or is there any solution?
Thank’s a lot and sorry for my english! Freebox is a french box so if some french helper is there!!?? :wink: