In the "Wheel Designer" ...
>> To open an existing wheel or dial design file
•Select the Open option from the "File" menu.
If you have made any changes to the current file, then you will be prompted to save them before a new file is opened. When you select this option, you will be presented with a file open dialog box from which you must select the required file. Solar Fire wheel design files have the file extension .wh1, .wh2, .wh3, .wh4, and dial design files have the extension .di1, .di2, .di3, .di4. This final digit in the extension indicates how many charts are included in the wheel or dial e.g. .di3 is dial design with three concentric charts. It is only possible to open files of one of these types. If you attempt to open a file of a different type, then a message will be shown indicating that the file cannot be read.