I download a .csv from firefox by choosing "open in OpenOffice."  It comes up in Calc read-only.  I click the toolbar "edit" button.  I get a dialog saying "The document cannot be edited, perhaps due to missing access rights.  Do you want to edit a copy?" [y/n]

This is suspect.  I'm an administrator user, the document is stored in my own AppData/Local/Temp folder, so I should clearly be able to edit it.  From here, I've taken two paths:

 - Click "yes," get a new document that looses the original name, and close it, returning to the original .csv
 - Click "no" and return to the original .csv

In either case, the original .csv is still read-only.  Clicking "edit" a second time has no effect.  I don't get the permission/copy dialog, it doesn't change the current csv to writable, and I cannot edit it at all except to save-as and manually re-open.