trying to unzip a .ods file

An ods file is very similar but not identical to an Office .xlsx file. These are both actually zipped as part of their format and if you don't have a program on the Mac that understands these formats it can get confused and think it just is a zip file. You don't unzip these files normally because the programs intended to use them do this internally.

GoogleDocs is a free way to open such files as is the free OpenOffice and LibreOffice programs.

Microsoft Office for Windows can also open these files but Microsoft as part of their longstanding policy of crippling their Mac products has not provided the ability to open these files in the Mac version of office - not even in Office 2016 for Mac. 😠

Just download either OpenOffice (https://www.openoffice.org/) or LibreOffice (http://www.libreoffice.org/) open the dos-file and maybe You will wonder, why You used Excel at all.

I've used excel from 1986 till 2001, then switched to OpenOffice (and to Linux), today I use LibreOffice and I love both of them.

Regards

Jean

Then it is likely an Open Office document. To open see:

http://fileinfo.com/extension/ods

What is the source of the .ods file?

An .ODS file is either a Open Office document or Outlook Express mailbox.