Peter

The file format was not fixed until RTM, it even changed after TR1.
Certainly files created in B1 or B2 (pre TR1) will NOT open in 2007 RTM

Unfortunately too, all versions of the Beta timed out yesterday

--
HTH
Nick Hodge
Microsoft MVP - Excel
Southampton, England
DTHIS
web: www.nickhodge.co.uk
blog: www.nickhodge.co.uk/blog/

FREE UK OFFICE USER GROUP MEETING, MS READING, 27th APRIL 2007
www.officeusergroup.co.uk

wrote in message
ps.com...
Would any of you be able to help with a similar issue?

I only installed one beta version of Office 2007: the "Beta 2" disk
which shipped with August 2006's PC Pro. So I guess that's pre
technical refresh. When the beta programme finished, we went back to
Office 2003.

I migrated my files, and my eldest son migrated his. Just now, my
youngest comes to me with a file he'd created & we can't open. Same
messages as above. File created in Jan 07, but the software hadn't
been updated since summer 06.

I can open it with Zip & examine the XML files - but he's got quite a
large table of numbers in there, so I'm not keen to go trying to
rebuild it from that!