I hope that won't present a problem reading MIPS CE 5.0 apps, like those in some later personal media players like my Viliv X5 and Cowon P5.
Looking at CE 1 files in a hexeditor, I noticed a long time ago that many of those files had 04 00 00 where one would expect to find the OS version. Since it was the first version of CE
(and, as C:Amie points out in "History of Windows CE," it was "widely considered to be a public beta"
), there may not yet have been a conclusion about how to number it. At the time I had no idea where they came up with 04 00 00, but the inclusion of the "4.0" designation as an extension of Windows NT, as C:Amie mentioned earlier in this thread, makes sense. Only Microsoft knows, and nowadays they seem to be denying that CE ever existed.
(The apps that have 01 00 00 instead of 04 00 00 were presumably written later, possibly even as CE 2.0 was being introduced.
)