You might prefer the way one viewer displays a particular file format over another viewer or the way the tools work in one viewer better than another viewer.
When you display a document, PowerWeb tries to use the first viewer in its list of available viewers for each file type. If the first viewer fails, it moves on to the next viewer in the list.
To use this feature, you must be an administrator of the computer or User Account Control (UAC) must be disabled.
Note:
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System administrators can disable this feature.
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For information about third-party viewer tools, refer to that viewer's documentation.
button.