The Storm Over Asia to A World at War transition rules are available in three different formats. This is because different people have different personal preferences and because each format has its own strengh.
The PDF rules are the files used to print out the rules. These are included with the game and can be used to reprint the rules, either because you want the latest version or because your version got damaged.
The help file rules is a single CHM file that contains all of the rules. CHM is an extension for the Compiled HTML file format and is most commonly used by Microsoft’s help programs. This format is the best for searching through the rules or for having a copy of the rules on your computer for when you don't have internet access.
The on-line rules are what they sound like -- the rules are directly available on this website. If you want a URL to bookmark to get directly to the Storm Over Asia rules, save this URL.
Updates: Storm Over Asia, like A World at War and many other GMT games, adopts a “living rules” approach – where the rules can be improved from player input, they will be. The plan for Storm Over Asia is to post updated rules on this website on June 30 of each year, and possibly on December 31 of each year if there are enough revisions to justify updates twice a year.