Choose Open from the File menu.
If you have unsaved changes, Icon Editor warns you that your changes will be lost by loading another icon. Click Cancel to cancel the Open command. Click OK if you don't want to save your changes.
Type the name of the file you want to load in the Enter file name field, or select the icon file you want to load from the Files section of the Open File dialog box.
When you load a file, the Output Format (in the Options menu) is automatically set to the format of the file you load.
You can also open an existing icon by double-clicking the icon file in File Manager.