I couldn't find a suitable Excel spreadsheet embed BBcode so I whipped up this one which looks to be working fine on 3.2.x. It is responsive to screen width and works for attachments (you have to attach the file first, then find it's URL with the filephp?id=#### format and embed that).
This could be used to easily embed tables, for example.
BBCode usage
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[excel]{URL}[/excel]
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<iframe src='https://view.officeapps.live.com/op/embed.aspx?src={URL}' width='100%' height='500px' frameborder='0'></iframe>
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excel: [excel]Enter URL of Excel file[/excel]
http://ausrotary.com/viewtopic.php?f=16 ... 64#p244364
There's probably better ways to do this, but this was my quick solution. Happy to take feedback on better options.