WinAlign error 70157

Dear Paul,

I'm experiencing a new problem, this time with WinAlign.

When I try to align two Microsoft Excel (2003) files I get the following error window saying: "(70157): This document could not be converted properly".  Once selected the two files, aligned the file names and selected the TMX TM exchange format, when I double click on the aligned source file (highlighted in black) I get the error message and cannot see the aligned project.

Can you please help me to solve this new problem?

Thank you in advance

Regards

Francesco