I think for anyone to really be able to help you we will need a bit more information and details.
As far as the difference in the way Excel 2011 vs Excel 2010 saves or formats a tab-delimited (.txt) file...I do not know. But I would imagine there might be some subtle differences since we are talking about Windows vs Mac OS.
I am sure another community member or MVP will be able to help you out once more details are provided.
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