Oh my god you are a genius !! you help me to understand the problem in 2 minutes !!!
I explain : it's a windows issue.
- The psp emulator castaway wants a File called TOS.ROM
- I rename it TOS.ROM BUT.... For windows : "right click / property / detail" it's name was still TOS.ROM.img
- I had to go to control panel to active "show extension of file..."
- I see now the real name with extension .img
- Then when I renamed it, it change extension and logo (the little image of my daemon tool to open .img changed to a piece of paper)
And of course it's still a disk image... shame on me.
It's so easy that nobody had my problem...
I am surprised that nobody is talking about PSP and Castaway since 2006. Even with all the Raspberry Pi and retro pie,
The PSP is really good to emulate easily a lots of retro games console including Atari ST, on a portable machine.
Thank you !