- Open Settings dialog box, expand the Editor node, and click Editor Tabs.
- In the Editor Tabs page, select the Mark modified tab with asterisk check box.
4.0+
- In the IDE Settings section of the Settings dialog box, click General.
- Select the Use "safe write" check box.
If this check box is selected, modified file will be first saved as a temporary file. If the save operation is completed successfully, the temporary file will renamed, and the original file will be deleted.

