| Extension Abbreviation | Extension Full name | How to open the File Extension |
|---|---|---|
| .acsm | Adobe Content Server Message File | How to open .acsm file |
| .aep | Activ E-Book Project | How to open .aep file |
| .apnx | Amazon Page Number Index File | How to open .apnx file |
| .ava | AvaaBook eBook | How to open .ava file |
| .azw | Amazon Kindle eBook File | How to open .azw file |
| .azw1 | Amazon Topaz eBook | How to open .azw1 file |
| .azw3 | Amazon KF8 eBook File | How to open .azw3 file |
| .azw4 | Amazon Print Replica eBook | How to open .azw4 file |
| .bkk | BookBuddi eBook File | How to open .bkk file |
| .bpnueb | PNU eBook File | How to open .bpnueb file |
| .cbc | Comic Book Collection | How to open .cbc file |
| .ceb | Apabi eBook File | How to open .ceb file |
| .cebx | Apabi XML eBook File | How to open .cebx file |
| .dnl | DNAML eBook File | How to open .dnl file |
| .ea | Kindle End Actions File | How to open .ea file |
| .eal | Kindle End Actions File | How to open .eal file |
| .ebk | eBook Pro eBook File | How to open .ebk file |
| .edn | Adobe eBook Activation File | How to open .edn file |
| .epub | Open eBook File | How to open .epub file |
| .etd | Adobe Reader EBX Transfer Data File | How to open .etd file |
| .fb2 | FictionBook 2.0 File | How to open .fb2 file |
| .fkb | Flipkart eBook File | How to open .fkb file |
| .han | Amazon Kindle eBook Data File | How to open .han file |
| .html0 | Book Designer File | How to open .html0 file |
| .htmlz | Zipped HTML eBook | How to open .htmlz file |
| .htxt | Hanvon eBook File | How to open .htxt file |
| .htz4 | HyperMaker 4 Publication | How to open .htz4 file |
| .htz5 | HyperMaker 5 Publication | How to open .htz5 file |
| .ibooks | Multi-Touch iBook | How to open .ibooks file |
| .jwpub | Jehovah's Witnesses Publication File | How to open .jwpub file |
| .kfx | Amazon KF10 eBook File | How to open .kfx file |
| .koob | Koob E-Book File | How to open .koob file |
| .mart | MartView eBook File | How to open .mart file |
| .mbp | Mobipocket Notes File | How to open .mbp file |
| .mobi | Mobipocket eBook | How to open .mobi file |
| .ncx | EPUB Navigation Control XML File | How to open .ncx file |
| .nva | NVA Document | How to open .nva file |
| .oeb | Open eBook File | How to open .oeb file |
| .oebzip | Zipped Open eBook File | How to open .oebzip file |
| .opf | Open Packaging Format File | How to open .opf file |
| .orb | Original eBook Reader File | How to open .orb file |
| .pef | PEF Braille Book File | How to open .pef file |
| .phl | Kindle Popular Highlights File | How to open .phl file |
| .pml | Palm Markup Language File | How to open .pml file |
| .pmlz | Zipped Palm Markup Language File | How to open .pmlz file |
| .pobi | Kindle Touch Periodical File | How to open .pobi file |
| .prc | Mobipocket eBook File | How to open .prc file |
| .qmk | YanCEyDesktop Quickmarks File | How to open .qmk file |
| .rzb | Red Zion Book File | How to open .rzb file |
| .rzs | Red Zion Security File | How to open .rzs file |
| .snb | Shanda Bambook eBook | How to open .snb file |
| .tcr | Psion Series 3 eBook File | How to open .tcr file |
| .tk3 | TK3 Multimedia eBook | How to open .tk3 file |
| .tpz | Kindle Topaz eBook File | How to open .tpz file |
| .tr | TomeRaider 2 eBook File | How to open .tr file |
| .tr3 | TomeRaider eBook File | How to open .tr3 file |
| .vbk | VitalSource eBook | How to open .vbk file |
| .webz | WEBZ Compressed eBook File | How to open .webz file |
| .ybk | YanCEyWare eBook | How to open .ybk file |
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