It does bite when it happens but two things for sure
1) You should never enter betas and use the software for real mission
critical work on live files
2) If you simply open a file created in a version pre-xl2007, then Excel,
since DF4 (Alpha) will open in compatibility mode. In this mode Excel will
automatically save back to a 97-2003 file, so the file has to be explicitly
converted, using save as...
Sorry it appears to have worked out like this for you, but I'm only a
messenger, not connected to MS
--
HTH
Nick Hodge
Microsoft MVP - Excel
Southampton, England
(e-mail address removed)
www.nickhodge.co.uk