File format error message

[Dianna B]

My Excel 97 is networked with other users in the
hospital. Only a few of our files are coming up with this
message. Message is: File Format Is Not Valid. Since
this is not affecting all of the files in Excel what
caused this error message on a few and how do we correct
it.

 

[Robert G. Spollen]

-----Original Message-----
My Excel 2002 is networked with other users. Only a few

of our files are coming up with this

message. Message is: File Format Is Not Valid. Since
this is not affecting all of the files in Excel what
caused this error message on a few and how do we correct
it.
.
I have been told that this will occur if I attempt to

open the file with MSWord. What can I do to restore the
file structure.