I noticed the file type when I had a look at the site, and thought I should send a message to Archie. Sorry forgot!
.ods is getting quite common, but not supported by MS Office, so lots of people won't be able to read it.
Although I've added a link to Open Office above, it is a full office application and therefore quite large. It's good, but not everyone might want to (or be allowed to) load it.
It you (Archie)are using Open Office, better to export your document to .pdf format from Open Office and post that to the website.