Invalid file extension or file format, template won't open

C

ChuInStLou

I have created a rather complex Excel spreadsheet with macros in 2007. Two
of the latter template versions I've created by adding features to the
spreadsheet will not open when I select File, New and then click on the
template name. I receive an error telling me the file extension or file
format is not valid or that the file is corrupted. How do I open the file
and what do I do to prevent my templates from becoming corrupted, if that is
the problem? This is very frustrating!!!
 

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