If your problem is that double-clicked XLSs open in Excel 2007 rather than
2003 then reset you file association by using Start-Run and enter your full
path to Excel 2003 like this:

C:\<Full path\OFFICE11\EXCEL.EXE /regserver

Note the space before the slash. This will run for 30 seconds or so and
then you should be good to go until the association get set back which seems
to happen every so often.

This has nothing to do with the compatibility pack which allows you to open
XLSX files in Excel 2003.

--
Jim
"Sean" wrote in message
...
|I did not download the "Compatability Pack" but somehow I seem to have been
| blessed with it regardless. The problem is I do not want to open XL2003
files
| in XL2007 as it can lead to loss of data (particularly any formulae that
use
| the XL2003 Analysis Toolpak).
|
| For numerous reasons, including import/export to Lotus and DBF, more
| reliable drawing tools, waaaay fewer bugs etc., I have to keep XL2003 on
my
| system, as well as XL2007.
|
| How do I disable the File Conversion utility so that XL2007 files will
only
| open in XL2007?
|
| Regards,
| Sean