PSVita SXD format? by basin at 4:39 AM EST on February 3, 2016
It's used in Welcome Park and Gravity Rush afaik.
Apparently it can store data as one .sxd file with the SXDF magic (possibly containing multiple streams). Or as a .sxd1 file with SXDF magic (this file looks like a header,always 272 bytes) and a .sxd2 with SXDS magic (actual data).
most of the work are going to be in app.db 1- add a value in table tbl_uri like the following NPXS10000;1;ux0; 2- modify NPXS10000 eboot.bin path in tbl_appinfo to vs0:app/NPXS10027/eboot.bin 3- overwrite the modified app.db using email app and reboot 4- now use the browser to call the new uri with your target game . example : ux0:app/PCSA00017 apparently near app will open the game manual. 5- minimize near then dump the game using the psp pboot trick using CMA (while the near app still open)
I found another game that uses the sxd1/2 pairs, Soul Sacrifice Delta. Although I don't have access to them yet, I know which archive they're in but the archive seems to be separately PFS encrypted on its own. Which would REALLY suck.