Can't open Excel attachments

After upgrading to Lion, any Excel attachments I receive from a windows machine will not open. Previously under Snow Leopard I was using an older version of Excel and never had any problems.
Since upgrading to Lion, I've taken to editing a document in Numbers, saving it as an Excel file and mailing it to a windows user as a windows safe attachment. The Windows user can open and edit it but I cannot open the edited file they return to me. Interestingly a friend's Windows pc has no trouble reading the attachment.
Does this sound like a Lion problem, or is there something on the Windows side causing problems?
Thanks in advance,
Pelennor

Hi! Thanks for your response, but I'm not trying to open the file in Excel. I guess the question is whether Numbers can open up an excel file (.xls). The workflow is:
1- create file in Numbers
2 - save file as an excel file (.xls)
3 - email file to partner as a Windows safe attachment
4 - partner updates file in Excel and sends updated file back to me
It's at this point where the problem occurs. I try to open the updated file and I can't. Numbers doesn't recognize it, yet a friend's Windows PC has no trouble. It's as if there's some kind of encryption occurring in step 4 that makes the file unreadable on the Mac.
I hope this clarifies the problem.
Again thanks for responding!

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