empty ods file

I have an ODS file - I was working on the file when my laptop shut down (dead battery). When I restarted the laptop and reopened the file, a text import window appears. I selected character set as ‘Unicode’ but the file contents are gone. The file still shows as having content (its 67kb) but I can’t see these contents.

Any idea’s how I can recover this file?

thanks

[Tutorial] The Dreaded Pound Signs: file reduced to #### (View topic) • Apache OpenOffice Community Forum While the Tutorial is more for Writer than Calc documents, the suggestions given apply to both