I'm a student and I often find myself opening lecture notes (in PPT format) to study. I don't need to edit them (and I don't want to accidentally edit them). After opening the file I usually click on the `Edit File` button to enter read only mode.

Is there a way that I can open the document directly as read only?

Thanks

EDIT: I'm using Ubuntu, but the files are stored in an NTFS partition, which is mounted as read-write. It would be nice if I can pass a parameter to OpenOffice, and not have to change the files themselves.