This option allows you to view previous versions of the document. The pop up will display all versions that have been added, plus any of the Comments that have been added.
The [...] option at the end of each row will give a few options such as:
Restore a previous version - if you do restore then this will be given a new version
View a previous version - none editable
Download a previous version
Fig 11 - Version History
There will be some filetypes that you will not be able to view as they are not files that are available in Open Office, you will however have the option to download and view them if required.
The filetypes that you are able to view are:
doc, docx, xls, xlsx, ppt, pptx, txt, csv, odt, rtf, odp, ods
All other filetypes cannot be viewed but can be downloaded.