Unable to play video on Vegas Movie Studio Platinum 9.0

I have a computer with operating system Windows Xp and also i have "Vegas Movie Studio Platinum 9.0" by which i play videos on my computer. This software is developed by Sony and it a great software by which i can play my sony handycam's video on my computer. But recently when i was trying to play AVI file, what i found that it was unable to open with this software. The software just show that no video and audio files. I don't understand whats going on, please help me for my problem.
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