May be this…

The file extension might be changed by the other user, which may also cause
this problem.

Copy and paste the file in new location and open a new excel workbook and
Press Cntrl+OFiles of TypeSelect All Files (*.*) from the drop
downLookinSelect the Path of the Fileselect the file and click Ok…

Remember to Click Yes, if this post helps!

--------------------
(Ms-Exl-Learner)
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"Dennis" wrote:

Hi I am using excel 2003 and everything was goin g fine until I tried to open
a file (which was working ok) but now won t open and just comes up with the
message
"Time Sheet 09-10.xls:file format is not valid" any ideas on how I can
either re save so it will open or any other ideads on how I access the info
it contains
thks
--
Dennis