This problem may occur if one of the following conditions is
The file was created by using Apple QuickTime version 3 or
You are trying to play a file format that is not supported
by Microsoft Windows Media Player.
You are trying to play a movie that contains audio and
video that are both in unsupported formats, such as a file with a .mov file
name extension that was originally created on an Apple Macintosh-based
computer. The Apple Macintosh-based computer has video and audio codecs that
are not supported by ActiveMovie or by Windows Media Player.
Video compression is not installed.
Microsoft Internet Explorer version 3.02 or later is not
installed on your computer. To install decompressors, you must have Internet
Explorer. Decompressors are used to play multimedia content. Although Internet
Explorer must download decompressors, Internet Explorer does not have to be
configured as the default browser.
Your Internet security options are not set to permit
decompressors to be downloaded.
Installation of the decompressor requires a restart of your
computer, but no restart occurred.
The codec that you must have to play the file is missing or
To resolve this issue, follow these steps. After each step,
test to determine if the issue is resolved.
Note Windows Media Player does not support playing every kind of media
file that is currently available, but does provide support for the most common
kinds of media files. Make sure that your media file is a supported kind. If
your media file is not a supported kind, do not continue past step 1. If
Windows Media Player does not support the file format that you are using,
contact the distributor of the file to inquire about the availability of a
viewer for the file.
Verify that Windows Media Player supports the file format
that you are using. Windows Media Player supports the following file formats:
Windows Media formats: .asf, .asx, .avi, .wav, .wax,
.wma, .wm, .wmv
Musical Instrument Digital Interface (MIDI) formats:
.mid, midi, .rmi
UNIX File formats: .au, .snd
Note Windows Media Player does not support playing .avi files that are
created by using the Microsoft MPEG4v3 codec. The file must be encoded again by
using the original source in a supported format such as the .asf format. To do
this, you can use the Windows Media tools. For additional information, visit
the following Microsoft Web site:
If you have access to the original source, contact the creator of
the file and request that the creator convert the file to a supported Windows
Media Player file type. Microsoft supports MPEG4v3 files in .asf streaming
format only. These files are not supported in an .avi file format.
Verify that you can play a media file that uses the same
file name extension as the file that you were playing when you received the
error message. For example, try to play a file that uses the same file name
extension from the Microsoft Windows 98 or Microsoft Windows Millennium Edition
CD-ROM. For Microsoft Windows XP, search the drive for the Windows Movie Maker
Sample.wmv file or for the files that are in the C:\Documents and Settings\All
Users\Documents\My Music\Sample Music directory.
information about file formats that Windows Media Player 7 and later support,
click the following article number to view the article in the Microsoft
Note Internet Explorer 6 is included with Windows XP. Do not try to
reinstall Internet Explorer 6 in Windows XP.
Lower your Internet security to medium. To do this, follow
Start Internet Explorer, and then click Internet Options on the Tools menu.
On the Security tab, click Internet.
Under Security Level For This Zone, click Default Level, and then move the slider to Medium.
Restart your computer and then try to play the file again.
If you still receive the error message, you may have to troubleshoot the codecs
that are installed on the computer. For more information about verifying,
installing, and troubleshooting audio codecs, see articles that are listed in
the "More Information" section.
If you receive this error message when you try to play a
file that was created with QuickTime 3 or 4, download the latest QuickTime
player. To do this, visit the following Apple Web site:
provides third-party contact information to help you find technical support.
This contact information may change without notice. Microsoft does not
guarantee the accuracy of this third-party contact information.
The third-party products that this article discusses are
manufactured by companies that are independent of Microsoft. Microsoft makes no
warranty, implied or otherwise, regarding the performance or reliability of