MOBI Types

Main MOBI Affiliation

.MOBI

File Ext:	.mobi
Class:	Mobipocket eBook Format

A file with a MOBI file extension is an eBook saved in the MOBI format, which was originally used by the Mobipocket Reader but is now supported by other readers. Aside from containing an eBook, the particular file may also contain Digital Rights Management (DRM) protection to stop unauthorized viewing or copying.

Organization:	Amazon
File Category:	eBook Files
Subkey:	HKEY_CLASSES_ROOT\.mobi

Software Programs That Open The Mobipocket eBook Format:

Calibre by Open Source

Windows

Mac

Linux

Icecream Ebook Reader by Icecream Apps

Windows

Mobipocket Reader Desktop by Amazon

Windows

Kindle App by Amazon

Windows

	Mac
	iOS

Android

Okular by Okular Team

Linux

Jutoh (formerly eCub) by Julian Smart

Windows

Mac

Linux

Geometer Plus FBReader by Geometer Plus LLC

Windows

Mac

Android

Linux

Blackberry

Cool Reader by Open Source

Windows

Mac

Android

Linux

Sumatra PDF by Open Source

Windows

BookReader by Leonid Mesentsev

Web

Optional Offer for FileViewPro by Solvusoft | EULA | Privacy Policy | Terms | Uninstall

Understanding MOBI Issues

Troubles Opening MOBI Files

Calibre Isn't There

You encounter an error message such as "%%os%% Can't Open MOBI Files" when trying to open your MOBI. Customarily, this means that Calibre is not installed on %%os%%. You won't be able to double-click to open your MOBI because your OS doesn't know what to do with it.

Tip: If you know of another program that can open your MOBI file, you can try opening it by selecting the application from the programs listed.

Obsolete Version of Calibre

Occasionally, you might have an outdated version of Calibre installed that's incompatible with your Mobipocket eBook Format type. If you do not have the proper version Calibre (or any of the other programs listed above), you may need to try downloading a different version of it, or one of the other software applications listed above. The primary cause of this problem is that your Mobipocket eBook Format file was created by a different (newer) version of Calibre than what's installed.

Tip: You can sometimes get hints about the right program version by right-clicking on the MOBI file, selecting "Properties", and looking at the version information.

Summary: In either case, the majority of problems opening MOBI files are related to not having the correct software application installed on your computer.

Other MOBI File Opening Causes

Even with the correct version of Calibre installed, you can still experience difficulties opening MOBIs. There can be external issues inside of %%os%% that are causing these errors when opening MOBIs. These other problems include (listed in order from most to least common):

• Invalid MOBI file references in the Windows Registry (the "phonebook" of the Windows Operating System)
• Deletion of the MOBI file description from the Registry by mistake
• Invalid installation of a MOBI-associated program (eg. Calibre)
• MOBI file corruption
• Malware-tainted MOBI file can't be opened
• MOBI-related hardware has device drivers that obsolete
• Windows has inadequate resources to open your Mobipocket eBook Format file