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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .ACSM | Adobe Systems Incorporated | eBook Files | Adobe Content Server Message File | Adobe Creative Cloud | Adobe Systems Incorporated |
| .AEH | Archos | eBook Files | Archos eBook File | EBooksWriter | Visual Vision |
| .AEP | Adobe Systems Incorporated | eBook Files | After Effects Project | Adobe After Effects | Adobe Systems Incorporated |
| .AVA | Open Source | eBook Files | AvaaBook eBook | AvaaPlayer | Open Source |
| .AZW | Amazon | eBook Files | Amazon Kindle eBook File | Calibre | Open Source |
| .AZW1 | Amazon | eBook Files | Amazon Topaz eBook | Amazon Kindle | Amazon |
| .AZW3 | Amazon | eBook Files | Amazon KF8 eBook | Calibre | Open Source |
| .AZW3R | Amazon | eBook Files | Amazon KF8 eBook | Calibre | Open Source |
| .AZW4 | Amazon | eBook Files | Amazon Print Replica eBook | Calibre | Open Source |
| .AZW6 | Amazon | eBook Files | Amazon Kindle Ebook | Amazon Kindle | Amazon |
| .BDB2 | Brainmaster Technologies | eBook Files | BrainMaster Settings | BrainAvatar | Brainmaster Technologies |
| .BEK | Shanghai Nutshell Electronics | eBook Files | Shanda Bambook eBook | Calibre | Open Source |
| .BFL | XnSoft | eBook Files | BFLI Image Format | XnView MP | XnSoft |
| .BKS | Microsoft Corporation | eBook Files | NTBackup Settings File | Microsoft Windows NT Backup - Restore Utility | Microsoft Corporation |
| .CBC | Open Source | eBook Files | Sony Portable Reader Comic E-book File | Calibre | Open Source |
| .CDRZIP | Founder Group | eBook Files | Apabi eBook File | Apabi Reader | Founder Group |
| .CEB | Founder Group | eBook Files | Apabi eBook File | Apabi Reader | Founder Group |
| .DFM | Open Source | eBook Files | Pascal File | Notepad++ | Don Ho |
| .DNL | LexisNexis | eBook Files | Concordance Database File | LexisNexis Concordance | LexisNexis |
| .EA | Amazon | eBook Files | Kindle End Actions File | Microsoft Notepad | Microsoft Corporation |
| .EBK | Internet Marketing Center | eBook Files | Ebook Pro Ebook File | The Internet Marketing Center eBook Pro | Internet Marketing Center |
| .EBX | IBM | eBook Files | Rational Rose 98 Compiled Script | Rational Rose | IBM |
| .EDN | Xilinx, Inc. | eBook Files | EDIF Implementation Netlist File | Xilinx ISE WebPACK | Xilinx, Inc. |
| .EDT | Adobe Systems Incorporated | eBook Files | Adobe eBook Download Settings | Adobe Digital Editions | Adobe Systems Incorporated |
| .EIG | easy HTools | eBook Files | Easy Index Generator | Easy Index Generator | easy HTools |
| .EPUB | IDPF (International Digital Publishing Forum) | eBook Files | Open eBook File | Adobe InDesign | Adobe Systems Incorporated |
| .ETD | Adobe Systems Incorporated | eBook Files | Adobe Reader EBX Transfer Data File | Adobe Acrobat DC | Adobe Systems Incorporated |
| .FB2 | Open Source | eBook Files | FictionBook 2.0 File | Calibre | Open Source |
| .FKB | Flipkart.com | eBook Files | Flipkart eBook File | Flipkart | Flipkart.com |
| .HAN | Amazon | eBook Files | Amazon Kindle eBook Data File | Notepad++ | Don Ho |
| .HTMLZ | Open Source | eBook Files | Zipped HTML Document Or E-book | Calibre | Open Source |
| .IBOOKS | Apple | eBook Files | Multi-Touch iBook | Apple iBooks | Apple |
| .IPEF | Implesys | eBook Files | iPublisherCentral eBook File | iPublish Central | Implesys |
| .KCB | Amazon | eBook Files | Kindle Textbook Creator File | Kindle Textbook Creator | Amazon |
| .KFX | Amazon | eBook Files | Amazon KF10 eBook File | Calibre | Open Source |
| .KML | Keyhole Corporation | eBook Files | Keyhole Markup Language File | ESRI ArcGIS for Desktop | ESRI (Environmental Systems Research Institute) |
| .LBXCOL | Libronix Corporation | eBook Files | Libronix DLS Resource Collection File | Logos Bible Software | Interscape |
| .LIT | Microsoft Corporation | eBook Files | Microsoft Reader eBook File | Calibre | Open Source |
| .LRF | Aequus Gaming LTD | eBook Files | League Of Legends Replay File | LOLReplay | Aequus Gaming LTD |
| .LRS | Open Source | eBook Files | Librie Reader Source File | Calibre | Open Source |
| .LRX | Sony | eBook Files | Sony Portable Reader File | Calibre | Open Source |
| .LUCI | Amazon | eBook Files | Amazon Kindle Fire Mobi Ebook Container | Amazon Kindle | Amazon |
| .MBP | Mobipocket | eBook Files | Mobipocket Notes File | MBP reader | Angelfire |
| .MOBI | Amazon | eBook Files | Mobipocket eBook Format | Calibre | Open Source |
| .NCX | IDPF (International Digital Publishing Forum) | eBook Files | EPUB Navigation Control XML File | Adobe InDesign | Adobe Systems Incorporated |
| .NVA | Ahn Nguyen | eBook Files | NVA Document | NVA Reader | NVA Reader, Inc. |
| .OEB | IDPF (International Digital Publishing Forum) | eBook Files | Open eBook File | Adobe InDesign | Adobe Systems Incorporated |
| .OPF | E-Book Systems | eBook Files | FlipViewer FlipBook File | FlipViewer | E-Book Systems |
| .ORB | Original eBook | eBook Files | Original eBook Reader File | ORB Reader | Original eBook |
| .PDG | Broderbund | eBook Files | Print Shop Deluxe Design File | The Print Shop | Broderbund |
| .PEF | Pentax | eBook Files | Pentax Digital Camera Raw Image Format | MacPhun ColorStrokes | Macphun |
| .PHL | Amazon | eBook Files | Kindle Popular Highlights File | Microsoft Notepad | Microsoft Corporation |
| .PML | Microsoft Corporation | eBook Files | Process Monitor Log File | Process Monitor | Microsoft Corporation |
| .PRC | Adobe Systems Incorporated | eBook Files | Product Representation Compact File | Adobe Acrobat DC | Adobe Systems Incorporated |
| .RB | Larian Studios | eBook Files | Divinity: Original Sin Game Data | Divinity: Original Sin | Larian Studios |
| .SEB | Franklin Electronic Publishers, Inc. | eBook Files | Franklin eBookMan E-book | Unknown Software | Unknown Developer |
| .SNB | Samsung Electronics | eBook Files | S Note File (Old Version) | S Note | Samsung Electronics |
| .TK3 | Night Kitchen | eBook Files | TK3 Multimedia eBook File | Tk3 Reader | Night Kitchen |
| .TPZ | Amazon | eBook Files | Kindle Topaz eBook File | Calibre | Open Source |
| .TR | Yadabyte | eBook Files | TomeRaider 2 eBook File | TomeRaider | Yadabyte |
| .TR2 | Yadabyte | eBook Files | TomeRaider eBook File | TomeRaider | Yadabyte |
| .TR3 | Yadabyte | eBook Files | TomeRaider eBook File | TomeRaider | Yadabyte |
| .TXTZ | Open Source | eBook Files | Compressed eBook File | Calibre | Open Source |
| .UBK | Craftsman Book Company | eBook Files | National Construction Estimator 32 User Costbook File | National Construction Estimator | Craftsman Book Company |
| .UMD | Ubisoft | eBook Files | Splinter Cell Blacklist Game Data File | Splinter Cell Blacklist | Ubisoft |
| .VBK | Veeam Software | eBook Files | Veeam Backup File | Veeam Backup & Replication | Veeam Software |
| .WLO | JinKe Electronic Company | eBook Files | WOLF eBook | Unknown Software | Unknown Developer |
| .XEB | Founder Group | eBook Files | Apabi eBook File | Apabi Reader | Founder Group |
| .XKS | IBM | eBook Files | IBM Softcopy Reader PDF Extended Bookshelf File | Softcopy Reader | IBM |
| .YBHTM | Simon Haynes | eBook Files | yBook HTML File | yBook | Simon Haynes |
| .ZTE | E-Tabs | eBook Files | E-Tabs Reader Document | E-Tabs Reader Lite | E-Tabs |
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