*pdb is the best known ebook format. I use eBook 1.03 in reading *.pdb files since it also reads *.prc ebook files. Anyway, after installing eBook v1.03 to your mmc... open your file manager, make a folder to e:system/apps/SW_Book and name it "Library". You can now save your pdb and prc files to e:system/apps/SW_Book/Library. When you open your eBook application, you will see the last book you've opened. If you want to see all your ebook files, click option, then Library.