Excel 2007 error: Different format than specified by the file extension


I receive the error shown below everytime I double click to open and excel file.  I found the following info on the internet:
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"In some cases after upgrading to Excel 2007, you may get the following error:
The file you are trying to open .xlsx is in a different format than specified by the file extension. verify the file is not corrupted and is from trusted source before opening the file. Do you want to open the file now?

This errors particularly occurs when you’re trying to open an XLS file (Excel 2000-2003) with Excel 2007. In most cases, the problem can be solved by defining MIME types and associating them with extensions."
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This is exactly the case.  I have Excel 2007 and the files I typically work with were exported from a web application and saved as Excel 2000-2003 files.

What does it mean by defining MIME types- how do I do that?  I would like to resolve this.
excel2.bmp
snyperjAsked:
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EnriquePhoenixCommented:
I believe you have to right click the item and hit "Open with", then select always open with this program.
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snyperjAuthor Commented:
Close enough.  Problem actually is that it is an html formatted doc with an .xls extension.
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