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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .AZW | Amazon | eBook Files | Amazon Kindle eBook File | Calibre | Open Source |
| .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 |
| .BEK | Shanghai Nutshell Electronics | eBook Files | Shanda Bambook eBook | Calibre | Open Source |
| .CBC | Open Source | eBook Files | Sony Portable Reader Comic E-book File | Calibre | Open Source |
| .CBR | Unknown Developer | Compressed Files | Comic Book RAR Archive | Calibre | Open Source |
| .CBZ | Open Source | 3D Image Files | Comic Book Zip Archive File | Calibre | Open Source |
| .EPUB | IDPF (International Digital Publishing Forum) | eBook Files | Open eBook File | Calibre | Open Source |
| .FB2 | Open Source | eBook Files | FictionBook 2.0 File | Calibre | Open Source |
| .HTMLZ | Open Source | eBook Files | Zipped HTML Document Or E-book | Calibre | Open Source |
| .KFX | Amazon | eBook Files | Amazon KF10 eBook File | Calibre | Open Source |
| .LIT | Microsoft Corporation | eBook Files | Microsoft Reader eBook File | Calibre | Open Source |
| .LRF | Aequus Gaming LTD | Game Files | League Of Legends Replay File | Calibre | Open Source |
| .LRS | Open Source | eBook Files | Librie Reader Source File | Calibre | Open Source |
| .LRX | Sony | eBook Files | Sony Portable Reader File | Calibre | Open Source |
| .MOBI | Amazon | eBook Files | Mobipocket eBook Format | Calibre | Open Source |
| .NCX | IDPF (International Digital Publishing Forum) | eBook Files | EPUB Navigation Control XML File | Calibre | Open Source |
| .OEB | IDPF (International Digital Publishing Forum) | eBook Files | Open eBook File | Calibre | Open Source |
| .PML | Microsoft Corporation | Data Files | Process Monitor Log File | Calibre | Open Source |
| .RB | Larian Studios | Game Files | Divinity: Original Sin Game Data | Calibre | Open Source |
| .SNB | Samsung Electronics | Compressed Files | S Note File (Old Version) | Calibre | Open Source |
| .TPZ | Amazon | eBook Files | Kindle Topaz eBook File | Calibre | Open Source |
| .TXTZ | Open Source | eBook Files | Compressed eBook File | Calibre | Open Source |
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