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\description{Gets the URI that should be previewed in a custom preview
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widget. See \code{\link{gtkFileChooserSetPreviewWidget}}.}
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\usage{gtkFileChooserGetPreviewUri(object)}
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\value{[char] the URI for the file to preview, or \code{NULL} if no file is
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\author{Derived by RGtkGen from GTK+ documentation}