NSNumber, containing int. If missing or 0 or negative, not read only; 1 or more, read only.
Note that this has nothing to do with the file system protection on the file, but instead can affect how the file should be displayed to the user.
Mac OS X v10.3 and earlier string constant is @"ReadOnly".
Available in Mac OS X v10.4 and later.
- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)