How to detect the availability of a DVD decoder upgrade?
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 If you previously clicked Upgrade Later when the upgrade page appeared in the Help and Support DVD Troubleshooter, a desktop shortcut was created. To upgrade your DVD decoder program, double-click the desktop shortcut. If no desktop shortcut exists, follow these steps to determine whether there is an upgrade available for your DVD decoder:
Click Start, click Run, type dvdupgrd /detect, and then press ENTER.
After you run the dvdupgrd /detect command, any detected DVD decoders are listed with either a "yes" or "no" to indicate that there is or is not an upgrade available from the manufacturer for both Microsoft Windows 98/95 and Microsoft Windows 2000 versions of the software.
Why can't I play a file at work that I can play at home?
This might happen if your computer at work doesn't have the same codecs installed on it that your computer at home does.
For example, if you are trying to play a DVD-Video disc or DVR-MS file on your computer at work and that computer doesn't have a DVD decoder installed on it, you won't be able to play that item until you install a compatible DVD decoder on your work computer.
Note that your system administrator at work might use Group Policy to prevent the Player from automatically downloading missing codecs or to prevent you from installing new codecs manually
How do I determine what format a file is in?
You might be able to tell the format of a file by looking at the file extension (such as .wma, .wmv, .mp3, or .avi). However, there are limits to this approach. Many programs create files with custom file extensions. And it's possible for anyone to rename a file without changing the file's format. A file with the extension .mpg or .dvr-ms, for instance, is usually just an AVI file that has been compressed by using some version of an MPEG video codec.
Are codecs and file formats the same?
 No, although it can be confusing because they sometimes have the same name. You can think of a file format as a type of container. Inside the container is data that has been compressed by using a particular codec.
For example, a file format such as Windows Media Audio contains data that is compressed by using the Windows Media Audio codec. However, a file format such as Audio Video Interleaved (AVI) can contain data that is compressed by any of a number of different codecs, including the MPEG-2, DivX, or XviD codecs. AVI files can also contain data that is not compressed by any codec. Consequently, you might be able to play some AVI files and not others, depending on which codecs were used to compress the file and which codecs you have installed on your computer. For the same reason, you also might be able to play the audio portion of an AVI file, but not the video portion.
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