Duke Carey wrote...
XLODBC.EXE install package checks for XL2002 and terminates if it is
not found.

They're still available for download, per

http://support.microsoft.com/kb/288118/en-us

so it seems Microsoft has nothing against Excel 2003 users using it.
As for XLODBC.EXE, it can be opened with most archivers (opens fine
with 7zip), and one only needs to extract XLODBC.XLA and XLODBC32.DLL
to any drive/directory one wants, then in Excel run Tools Add-
ins..., click on the Browse button, locate and select XLODBC.XLA. As
long as the .XLA and .DLL files are in the same place, this add-in
works under Excel 2003.