(2018-05-09, 23:42)tris20 Wrote: 1- what emulators systems are supported?
It depends on the OS / platform you are using. You can have a look on
Game add-ons list (official wiki). I think it is not totally up-to-date, but it is almost complete.
(2018-05-09, 23:42)tris20 Wrote: 2 fan art and clear logo art like when browsing movies?
Not directly in retroplayer yet, but you can use IARL addon, that has this kind of support for remote files at internet
archive. On your local games you would have to create s repository for this addon
(2018-05-09, 23:42)tris20 Wrote: 3 is it a bit the same like lakka from libretro? because if so you guys did a way beter job.
It is based on libretro and libretro cores and it is (obviously) part of Kodi (previously XBMC) - multimedia center.
(2018-05-09, 23:42)tris20 Wrote: 4 is it possible to add theme music when browsing games?
No. Such feature is not part of Kodi (AFAIK). If you want it, it has to be added to Kodi and subsequently it would be possible to use it in Retroplayer. Or maybe there is some addon for kodi that has such feature, but I don't know about it.
(2018-05-09, 23:42)tris20 Wrote: 5 can we add external exe files like pcsx2?
Not directly in Retroplayer AFAIK. But with IARL addon you can probably add external loaders (obviously exe files would be working just on windows builds of Kodi).
Note: I am not an author neither a coder of this addon. I am just a happy user.