| 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 |
| sva | Manga Browser Comic |
| tcr | Psion Series 3 Ebook |
| tcr | 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 |
