You can link to a variety of media within a lesson including the following. Please be aware that certain browsers and settings may only support certain file types.
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Type
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Fomats supported
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audio
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aiff, au, mid, midi, mp3, ra, ram, rmf, wav, wma
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flash
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swf
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images
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gif, jpeg, jpg, gif, png
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Shockwave
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dcr
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video
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Some file types such as PowerPoint may require viewers to work with the browser. See the FAQ How can students view my PowerPoint file in SoftChalk?