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The conversion should be automatic. Try re-installing the converter on the problem PC
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I found the solution in the end.
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Hi Experts,<br />
<br />
I have 2 PC's, both running office 2003. both have the 2007 compatibility pack installed. both are identical in setup.<br />
<br />
1 PC wont open .xlsx files, I know that the file extension is suppose to point at Microsoft Open XML converter but I don't know where I am browsing to find it.<br />
<br />
for example excel is located in : C:\Program Files (x86)\Microsoft Office
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Hi Experts,

I have 2 PC's, both running office 2003. both have the 2007 compatibility pack installed. both are identical in setup.

1 PC wont open .xlsx files, I know that the file extension is suppose to point at Microsoft Open XML converter but I don't know where I am browsing to find it.

for example excel is located in : C:\Program Files (x86)\Microsoft Office

Excel Document - incorrect extension

Microsoft Excel topics include formulas, formatting, VBA macros and user-defined functions, and everything else related to the spreadsheet user interface, including error messages.

Microsoft Excel

Microsoft Office is an integrated suite of applications that includes Outlook, Word, Excel, Access, PowerPoint, Visio and InfoPath, along with a number of tools to assist in making the individual components work together. Coding within and between the projects is done in Visual Basic for Applications, known as VBA.