cgsecurity.org

In the list of document types, I did not see the choice for ODT or ODS, etc.. Are these not covered?

ods and odt files consist of information that is packed into a ZIP file. Technically those are ZIP files. Try renaming one and look inside...
This is why they are part of the ZIP family.

https://www.cgsecurity.org/wiki/File_Fo ... y_PhotoRec

Sorry, but I don't understand. Surely those text formats are not compressed files.

Rename a Windows excel file ending with xlsx into a zip file. Then try to open it up.

I do not use windows. I do not understand what you are trying to explain.

Start Calc from LibreOffice. Open a new table calculation file and save it as myfile.ods. Close LibreOffice, rename myfile.ods to myfile.ods.zip. Open this ZIP file by double-clicking it or open it up from the command line.

You should see a file and folder tree pop up. This is the content of your ods file. It carries the extension ods only to inform your operating system about the right program to open this file. Technically, byte-wise, it is a compressed ZIP archive.

It is, is it? Wow, I did not know that.

So what will be the exact file extension when the recovery is done? Will it be a .zip?

Yes.