You might be able to use something like this:
var file:File = File.desktopDirectory.resolvePath('Yodl_RBI.ppt.zip'); navigateToURL(new URLRequest(file.url));
Usually it opens an asset in a browser window, but for images, etc. such work.
However, if you point it to a folder, it will usually open a folder containing an item that is halfway ...
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