Unzip the file, that will place it somewhere.
Then open OpenOffice and navigate to the file to open.
The problem with Excel is not what you see, but what you don’t see.
Step by step:
1. Download the sample CSV or export a CSV from your GD site.
2. Open OO
3. Navigate to the downloaded file.
4. adjust as required, and save. When asked to save as ODS, say no.
The attached CSV file is not correcty formatted, follow the steps above.
If you want the listings to import and appear on the map, you will need lat and lng. There is a bulk tool for that:
https://wpgeodirectory.com/docs/core-export/#tips
Having CA instead of California will not fail the import, but it will create a region called “CA” meaning you will end up with two regions: “CA” and “California”. So you should replace all “CA”s with California.