Ebook File Extensions
| Extension | File Type |
|---|
| xks | IBM Softcopy Reader PDF Extended Bookshelf File |
| ybhtm | yBook E-book HTML Document |
| ybk | Yanceyware eBook |
| ybtxt | yBook E-book Text Document |
| yjf | Kindle v10 KFX Ebook Metadata |
| yjr | Kindle v10 KFX Ebook Metadata |
| zte | E-Tabs Format E-book |
| zub | Zubu Reader Magazine |