Excel 2007: File Extension Warning

M

marshallemail

I've created a file extension for Excel workbooks and associated the
extension with Excel. No problem opening the file with older versions
of Excel. With Excel 2007 I get a message stating that the file "is
in a different format than specified by the file extension". I can
select Yes to open the file, but I'd like to bypass this warning if
possible. I tried adding the file's location to the Trusted Sources
list, but that didn't affect this warning. Any suggestions?
 
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