Subject: Help Recovering Overwritten OpenOffice Calc File

[Basar Amuria]

Hello OpenOffice Support,
I accidentally saved new data over an existing OpenOffice Calc file
(cash.ods). The original data was important, but after saving, the previous
content is no longer visible.
I am using Apache OpenOffice 3.3 on Windows. I checked Windows Previous
Versions and the OpenOffice backup folder, but I could not find an older
copy.
Is there any way to recover the original data from the overwritten file?
Thank you for your help.