This is a wild shot. But apt.

If your running Outlook and can access Outlook from home ...

Try storing the XL document in your Drafts folder - and NOT emailing
it.

When you're at home fetch it from your Drafts folder.

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If you don't have Outlook.

Create an account at geocities.yahoo.com.

It looks like a pay service, but actually, if you look hard enough
you'll discover you can save more than a GiG for free.

Save your XL document there and fetch it via http.

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Or create a yahoo email account.

Send a message to yourself and attach the XL worksheet.

See if that works.