Hi, the textures from latest FM22 will be either rx3 or pvr I think ( not sure).
Rx3 files, as we know ...various options are there. Fifa converter, filemaster/CM/rx3master etc..
Pvr files can be opened with a tool called "Pvrtextool" :
https://developer.imaginationtech.com/pvrtextool/
Once this tool is installed, we can directly open pvr files ..can convert from png to pvr and vice versa.
So rx3 to pvr can be done by:
1.Rx3 to png (fifa converter or rx3 master)
2. Png to pvr by using pvr textool.( Save as pvr format).
I think plugin support for photoshop is also there for pvr..but I usually use pvr textool, as it gives me all options with this format.