@Lunaaa
Sorry but Kobo software haven't any file structure to show the books, and also no filename is show in any way. You can consider "collections" in your kobo library like tags because you can put any books in all the collections you want (i.e. "Terror", "SiFi", "Asimov",...) and search through they or apply a filter. For this job you can use Calibre on your PC (more easy than in Kobo device).
About KOReader and KSM09, last one work well in
H2O2 v1 but not in v2 (you must see
that).
Alternatively, you can install
KFmon to use KOReader from Kobo software.