Bug reporting page version in Whistler build 2267.idx01.000910-1316 is 5.00.00.5119. Judging by the build number, this could be from a later Neptune build. However, bug reporting page in Whistler build 2223.1.main.000411-2307 is the last to dump bug reports into
C:\neptune_bugs. As of build 2250.main.000628-2110, bug reports are dumped in
C:\whistler_bugs, which suggests that these bug reporting pages were changed since Neptune or even completely rewritten and simply continued the version numbers.