You try to open a media file in Windows Internet Explorer 8 on a computer that is running Windows 7. If the media file contains a space in its path or in its file name, you receive the following error message in Windows Media Player:
Windows Media Player cannot play the file. The Player might not support the file type or might not support the codec that was used to compress the file.
The affected media files include files that have the following extensions:
This issue occurs because Internet Explorer 8 calls the CreateProcess function by using a URL-encoded path when it handles the affected file types. Windows Media Player cannot open URL-encoded paths. Therefore, you receive the error message.
You do not experience this issue when you try to open an .mpg file.
Usually, Internet Explorer should call the CreateProcess function for Windows Media Player by using a non-URL-encoded path if the file has a space in the path or file name.
Security update information
To resolve this problem, install the most recent cumulative security update for Windows Internet Explorer. To do this, visit the following Microsoft website: