SAPGUI 7.20 / Excel 2010 - Workbook is corrupt and cannot be loaded

Hi all:

SAPGUI 7.20 SP 0

Excel 2010

BW 7.0

Queries run fine in Analyzer. No issues.

However, whenever we try to open a workbook saved in Excel 2007 we get this error "The workbook is corrupt and cannot be loaded".

These workbooks are executed fine from any PC with Excel 2007, same SAPGUI version (7.20 SP 0).

Furthermore, if we open a query and save a workbook (now in Excel 2010) we get the same error "The workbook is corrupt and cannot be loaded".

Basically, we can't open workbooks.

Since the only difference in both scenarios is Excel (same SAPGUI) I checked in some Microsoft forums and read something about incompatibilities in the new Visual Basic coding in Excel 2010 compared to 2007.

Other than that, nothing else so far.

Any ideas or suggestions?

Thanks in advance,

Luis