Hmm.
Somewhere in your computer's lifetime, it was told that file extensions with .sit or perhaps .hqx or perhaps .dmg should be opened in Excel. I am trying to find where you can configure how the extensions determine applications, but am at a loss for the moment.
In the meantime, you can tell Safari to save the file in a folder, and then after the download is done, go to Stuffit Expander, and manually decompress the file, and mount the disk image.
Christian
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