System 800xA,Basic History, AdvHtLogDataViewer failed to open files
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I assume you are not trying to open files in active use (e.g. by temporarily stopping Basic History service provider in concerned node) then your finding about 2GB boundary might be a "works as designed".
You could try to set the LargeAddressAware bit on the tool .exe with some MS tool (search Internet for tools available).
Probably, you need to file a support case to get this addressed.