hidden in worksheets or documents that appear regular and harmless. The new exten-
sion for files with macros provides a better warning to the users and minimizes security
risks through regular Excel files. Correspondingly, if a template has macros in it, it will
be saved with extension .xltm. Since a large Excel user-base already exists, the older
file extension of .xls is also recognized by Excel 2007; you can even save files with this
extension. Such files are said to be saved in the Compatibility mode. Excel 2007 offers
another file format with the .xlsb extension. This format is a proprietary format, and
is mean ...
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