Set Edits to Read-Only Files
Use this procedure to edit read-only files in Open Plan and save them using a new name.
To set edits to read-only files:
On the File menu, click Preferences > Application.
On the Options dialog box, click the Advanced tab.
Click the Default button.
Scroll to the end of the grid.
In the Category column, enter the value _ALLOW_EDIT_READONLY.
In the Default Value column, enter the desired numeric value.
Click OK to dismiss the System Preferences dialog box.
Click OK to dismiss the Options dialog box.