This file is not in a recognizable format error message.

I get the error message , This file is not in a recognizable format. However the file extension is .xlsx and I have opened these files in the past. As far as I know nothing in my computer has changed. I have Excel 2003 

 
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Last updated July 10, 2018 Views 15,474 Applies to:
Answer

If you really did open a .xlsx file in XL2003, and can't do it now, then you must have had a Helper Viewer utility installed at the time which is no longer functioning.

A Google search for ".xlsx viewer download" will return many hits such as this........

 http://support.microsoft.com/kb/925180

hth

Vaya con Dios,

Chuck, CABGx3

 

=SUM(091938,USMCe4,WACS'61,USPatD248465, DADx3,CABGx3+AAA,MMOUS2k,VBAxlDev,MCC2011)

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