Lotus Notes – Cannot write or create file (file or disk is read only)

When trying to open an mailfile (.nsf) from a CD-Rom I got the following error:

Error: “Cannot Write or Create File (file or disk is read only)”

To work around this I copied the file locally, and right clicked the nsf file > Properties

I then took of the “Read only” attribute (un-ticked)

Once done the file then opened in Lotus Notes.

This happens because Lotus Notes needs to rebuild the index and thus has no access when on read only.

Here is the IBM Technote for this issue: