Here is the best explanation I can find: http://www.dependencywalker.com/help/html/version_numbers.htm
VERSION OF THE IMAGE . This value is set by the module developer using the VERSION instruction in their DEF file or using the link / VERSION option. It is usually a version of a module or product of which the module is a part, but may contain any value because the developer must install it. If the developer does not specify the version, then this value will be equal to 0.0 by default. This value can be used as a last resort when comparing two modules to check which module is newer.
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