Sorts of OPF Files

Main OPF Affiliation

.OPF

File Format:	.opf
Class:	FlipViewer FlipBook File

A flipbook which can be read using FlipViewer. It is stored in the XML formatted OPF (OEB Package Format). It also saves the metadata which gives a description of the content and a list having the pages, images as well as text referenced by the publication.

Organization:	E-Book Systems
Function:	Data Files
Folder:	HKEY_CLASSES_ROOT\.opf

Software Programs That Open The FlipViewer FlipBook File:

FlipViewer by E-Book Systems

Windows

Mac

Secondary OPF Associations

.OPF

File Format:	.opf
Class:	FlipAlbum File

Digital photo album made using FlipAlbum; an application used to organize images into picture albums. It saves the album appearance, structure, settings as well as references to image files.

Organization:	E-Book Systems
Function:	Uncommon Files

Software Programs That Open FlipAlbum File Files:

FlipAlbum by E-Book Systems

Compatible with:

Windows

Mac

.OPF

File Format:	.opf
Class:	Open Packaging Format File

A file in Open Packaging Format (OPF) standard that is a part of EPUB eBook specification. It saves eBook information such as the title, book ID, language, reading order, creator, and display formatting. It specifies eBook as part of an .EPUB archive.

Organization:	IDPF (International Digital Publishing Forum)
Function:	eBook Files

Software Programs That Open Open Packaging Format File Files:

Adobe InDesign by Adobe Systems Incorporated

Compatible with:

Windows

Mac

Geometer Plus FBReader by Geometer Plus LLC

Compatible with:

Windows

Mac

Android

Linux

Blackberry

Adobe Digital Editions by Adobe Systems Incorporated

Compatible with:

Windows

	Mac
	iOS

Android

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Troubleshooting Problems Opening OPF Files

Issues Opening OPF Files

FlipViewer Disappeared

When you double-click your OPF file, you may see a dialog box from your operating system stating that it "Cannot Open This File Type". Generally, this is experienced in - because FlipViewer isn't installed on your PC. The typical path of opening your OPF with a double-click won't work because - cannot make the program connection.

Tip: If you don't have FlipViewer installed, and you know of another program to open your OPF file, you can try opening it by selecting from the programs listed under "Show Apps".

Obsolete Version of FlipViewer

Your FlipViewer FlipBook File file is incompatible with FlipViewer because you might have the wrong version installed. If you've got the wrong version of FlipViewer installed, you'll need to install the correct version. This issue mainly occurs when your FlipViewer FlipBook File file was created by a newer version of FlipViewer than you have on your PC.

Tip: If you right-click on your OPF file, then select "Properties" (Windows) or "Get Info" (Mac), you can obtain hints about what version you need.

Summary: Not having the right FlipViewer version on your computer can cause problems opening OPF files.

Other Causes of OPF File Opening Problems

You can still experience errors opening OPF files even with the latest version of FlipViewer installed on your PC. There can be external issues inside of - that are causing these errors when opening OPFs. Issues that aren't software-related:

• OPF file references in the Windows Registry are broken
• Corruption of the OPF file description inside the Registry
• Partial installation of FlipViewer that did not fully complete
• Your OPF file is corrupted (issues with your FlipViewer FlipBook File file itself)
• Past or present virus infection has affected your OPF
• Device drivers for OPF-related hardware are out-of-date
• Your PC doesn’t have enough available resources to open the FlipViewer FlipBook File file