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many be is avi 檔
you can useK-Lite Codec Pack
K-Lite Codec Pack is a collection of codecs and related tools. Codecs are required to encode and/or decode (play) audio and video. The K-Lite Codec Pack is designed as a user-friendly solution for playing all your movie files. With the K-Lite Codec Pack you should be able to play 99% of all the movies that you download from the internet.
The K-Lite Codec Pack has a couple of major advantages compared to other codec packs:
- It it always up-to-date with the latest versions of the codecs.
- It is very user-friendly and the installation is fully customizable, meaning that you can install only those components that you really want.
- It has been very well tested, so that the package doesn't contain any conflicting codecs.
- It is a very complete package, containing everything you need to play your movies.
http://www.free-codecs.com/download/K_Lite_Codec_Pack.htm
Real Alternative
Real Alternative will allow you to play RealMedia files without having to install RealPlayer/RealOne Player.
You do need a player that is capable of playing RealMedia. The included Media Player Classic supports it and works very well. Supported: RealAudio (.ra .rpm), RealMedia (.rm .ram .rmvb .rpx .smi .smil), RealText (.rt), ReadPix (.rp), RealMedia embedded in webpages. .smi and .smil files sometimes only play the first part of a clip. This is a limitation of the current Media Player Classic. The RealMedia Browser plugin supports Internet Explorer, Opera, Netscape and Mozilla.
http://www.free-codecs.com/download/Real_Alternative.htm