Question : How can I modify a Saved Import spec FROM EXCEL in Access 2007?

I have seen other questions about modifying a Saved Import spec in Access 2007, but not when the data was being imported from Excel.  This was very easy in all versions up to now.  Access 2007 is really giving me a run for my money and this is one quirk I can't seem to overcome.  I can't imagine that they would have removed this functionality.  Surely they don't expect us to get every import spec exactly right on the first try...  
Please help!

Answer : How can I modify a Saved Import spec FROM EXCEL in Access 2007?

For non-Text, you will have to do this:

Right-click on Tables (or the header) in the left Navigation Pane, choose "Navigation Options"
On the bottom left, click on "Show System Objects".
You will see the tables MSysIMEXSpecs and MSysIMEXColumns in the table list.
They contain the definition of the Import task.

To change the source file, when you bring up Saved Imports from the Ribbon, External Data, Import group, just click on the file name and change it.

There is no UI to revisit the setup in Access 2007.