Types of H261 Files

Primary H261 File Association

.H261

File Format:	.h261
File Type:	H.261 video format

Created by:	CCITT Study Group XV Specialists Group on Coding for Visual Telephony
File Category:	Video Files
Registry Key:	HKEY_CLASSES_ROOT\.h261

Software Programs That Open The H.261 video format:

H.261 video format by CCITT Study Group XV Specialists Group on Coding for Visual Telephony

Windows

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Troubleshooting Problems Opening H261 Files

Common Problems Opening H261 Files

H.261 video format is Not Installed

When you double-click your H261 file, you may see a dialog box from your operating system stating that it "Cannot Open This File Type". If this is the case, it's usually due to the fact that you do not have H.261 video format for %%os%% installed on your computer. Because your operating system doesn't know what to do with this file, you won't be able to open it by double-clicking.

Tip: If you know of another program that can open your H261 file, you can try opening it by selecting the application from the programs listed.

Wrong Version of H.261 video format is Installed

In some cases, you might have a newer (or older) version of a H.261 video format file that is unsupported by your installed application version. If you do not have the proper version H.261 video format (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. This problem is most common when you have an older version of the software application, and your file was created by a newer version that it cannot recognize.

Tip: Sometimes you can get a clue about the version of H261 file you have by right clicking on the file, then clicking on "Properties" (Windows) or "Get Info" (Mac OSX).

Summary: In either case, the majority of problems opening H261 files are related to not having the correct software application installed on your computer.

Other Causes of H261 File Opening Problems

Although you might already have H.261 video format or another H261-associated software installed on your computer, you can still encounter problems opening H.261 video format files. If you are still having problems opening H261 files, there may be other issues that are preventing you from opening these files. These other problems include (listed in order from most to least common):

• Invalid H261 file references in the Windows Registry (the "phonebook" of the Windows Operating System)
• Accidental deletion of the description of the H261 file in the Windows registry
• Incomplete or bad installation of a software application associated with the H261 format
• Your H261 file is corrupted (issues with your H.261 video format file itself)
• Your H261 is infected with malware
• Device drivers of the hardware associated with your H261 file are corrupt or out-of-date
• Your computer does not have the adequate system resources to open the H.261 video format format