I just downloaded MS Office 2011 to my Notebook.  Having trouble opening excel files.

When I try to open xcel spreadsheets from my thumb drive, it gives me the following msg: the file format or extension is not valid.Verify that the file has not been corrupted and that the file extension matches the format of the file. The file extension reads: xlxs
I can open all other files on my thumb drive. If the advice is that I need to change the file extension, how would I go about doing that?

I think you are talking about *.xlsx files which are the default format for Excel both Windows an Mac versions. Try opening the file within in the program. Example file, open, then select your file. If that don't work try opening the file in Excel for Windows and resaving it as a .xlsx and a .xls version then see which one opens on the Mac Office.

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