Mac OS X: How to get information about applications, files, folders and disk drives

You can also change settings for these items.

Mac OS X 10.0 - 10.1.5
In a Finder window, select the item and choose Show Info from the File menu. Use the General Information pane to lock a file or folder and make a file work like stationery.

Choose Name & Extension from the pop-up menu to change the name of the item and show or hide the filename extension.

For a file, choose "Open with application" to select the application to open the file.

Choose Privileges to change access privileges for an item.

Mac OS X 10.2
In a Finder window, select the item and choose Get Info from the File menu. To protect your files from being changed or deleted, you can lock them. In the Finder, select the file you want to protect and choose Get Info from the File menu. Select the Locked checkbox.

To make changes to the file, deselect the Locked checkbox.