(Solved) - Openning an attachment ending .xlsx(8 posts)
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xlsx is the extension of excel 2007 and excel 2010 , you can open it with one of them if you can install office 2007 or 2010 on your PC.
In case you are using another version (office 2002 or 2003 or ...), you can simply convert the xlsx to xls using the online converter :
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