Add spaces: DidsomeoneemailyouaHKIfileandyou'renotsurehowtoopenit?MaybeyouhavefoundaHKIfileonyourcomputerandwonderingwhatit'sfor?Windowsmighttellyouthatyoucan'topenit,orintheworstcase,youmightencounteraHKIfilerelatederrormessage.

Answer: Did someone email you a HKI file and you're not sure how to open it? Maybe you have found a HKI file on your computer and wondering what it's for? Windows might tell you that you can't open it, or in the worst case, you might encounter a HKI file related error message.

Add spaces: 3FootNinjaIIThisisagreatfightinggamewithacuteninjacharacter.

Answer: 3 Foot Ninja II This is a great fighting game with a cute ninja character.

Add spaces: OfcoursethenotationpredatestheYoshizawa-Harbin-Randletsystemoftoday.

Answer:
Of course the notation predates the Yoshizawa-Harbin-Randlet system of today.