Here's a reprint of Brad Town's post:
Apparently a particular registry entry, normally added during Office
2007's installation, is not added when Office 2007 is installed on
Windows 7. To work around this so you can edit iParts with Excel 2007 on
64-bit Windows 7, you can try the attached workaround script.
NOTE: The following has only received minimal testing by me on a handful
of machines. Only implement the workaround if you absolutely need a fix
*now*.
The first time you run the script, it will copy the 32-bit entry to the
64-bit location in your registry so 64-bit Inventor can find Excel. If
you run it again, it will remove the new entry.
If you'd prefer to do it manually, use Registry Editor, find
"HKEY_CLASSES_ROOT\CLSID", add the
"{00024500-0000-0000-C000-000000000046}" key below it, add the
"LocalServer32" key below that, and set its default value to
'"C:\Program Files (x86)\Microsoft Office\Office12\EXCEL.EXE"
/automation' (substitute the correct path for your machine).
We're currently looking into fixing this without requiring such a
workaround.
Brad Town
Software Developer
Autodesk, Inc.
--
Dennis Jeffrey, Autodesk Inventor Certified Expert
Autodesk Manufacturing Implementation Certified Expert.
Instructor/Author/Sr. App Engr. Tel. (260) 399-6615
http://teknigroup.com