We save our Excel and Word files as XML, so that we can do search and replace
operations over the XML text files. This causes the following problem: Even
though the XML files contain information about which MS Office application
was used to create the document (e.g. <?mso-application
progid="Word.Document"?> ), when I double click on an Excel file in Explorer,
the file opens up in Word, regardless of whether it is an Excel XML file or a
Word XML file. Is there a way to make Explorer more intelligent when opening
up such files (e.g. via a registry key setting)?