| mbp1 | Amazon Kindle Touch Annotations Data |
| mbpkg | Mobipocket Reader Package |
| mbpv2 | Amazon Kindle Annotations Data |
| mobi | Mobipocket Reader E-Book |
| mpub | Mobcast Mobile Optimized ePub Book |
| nat | Natata eBook Compiler Document |
| ncx | EPUB Navigation Control XML |
| nh | China Academic Journals NH Document |
| nva | NVA eBook Document |
| oeb | Open Electronic Package Ebook |
| oebzip | Zipped Open eBook |
| opf | Open Electronic Package Ebook |
| pdb | Plucker Ebook |
| pdg | SSReader Digital Book |
| pef | Portable Embosser Format Book |
| phl | Amazon Kindle Public Highlights Data |
| pkg | Apple Newton eBook |
| pml | Palm Markup Language File |
| pmlz | Compressed Palm Markup Language File |
| pobi | Kindle Touch Periodical Data |
| prc | Mobipocket Reader E-Book |
| qmk | YanceyDesktop Quickmarks File |
| rb | Rocket eBook |
| rzb | Red Zion Book |
| rzn | Red Zion Notes |
| sbrz | Sky Ebook Reader Encrypted Ebook |
| seb | Franklin eBookMan E-book |
| smbp | Mobipocket E-book Secured Auxiliary Data |
| snb | Shanda Bambook eBook |
| stk | STAReBOOK Ebook |
| sva | Manga Browser Comic |
| tcr | Psion Series 3 Ebook |
| TCR E-book |
| tebr | Tiny eBook Reader Ebook |
| text | yBook E-book Text Document |
| tk3 | TK3 E-Book |
| tpz | Amazon Topaz E-book |
| tr | TomeRaider 2 E-book |
| tr2 | TomeRaider 2 E-book |
| tr3 | TomeRaider 3 E-book |
| txtc | Compressed eBook Text |
| txtz | ZIP Compressed Text Ebook |
| ubk | Embiid Reader eBook |
| updb | cBook Ebook |
| vbk | VitalBook eBook |
| webi | Web Book Internal Format eBook |
| webz | WEBZ Compressed eBook |
| wmga | Web Manga Document |
| wol | WOLF eBook |
| wolf | WOLF Document |
| xeb | Apabi eBook |
| xks | IBM Softcopy Reader PDF Extended Bookshelf File |
| ybhtm | yBook E-book HTML Document |
| ybk | Yanceyware eBook |
| ybrar | yBook E-book Archive |
| ybrtf | yBook E-book RTF Document |
| 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 |
