Nothing.
Those fields in the IMAGE_OPTIONAL_HEADER structure are meaningful only when they appear in the EXE. The values provided in DLLs are ignored.
SizeOfHeapReserve and SizeOfHeapCommit fall into the same category. In general, flags and fields which control process settings have no effect when declared in a DLL. We’ve seen a few examples already, like the /LARGEADDRESSAWARE flag or the markers which indicate the default layout direction.
Raymond has been involved in the evolution of Windows for more than 30 years. In 2003, he began a Web site known as The Old New Thing which has grown in popularity far beyond his wildest imagination, a development which still gives him the heebie-jeebies. The Web site spawned a book, coincidentally also titled The Old New Thing (Addison Wesley 2007). He occasionally appears on the Windows Dev Docs Twitter account to tell stories which convey no useful information.
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