MS's Chip's Challenge keeps your scores and passwords in a file called ENTPACK.INI. It is located in your Windows directory, which is usually C:\WINDOWS. Therefore, to avoid losing your hard work, be sure to make backup copies of that file. Similarly, when transferring the program from one machine to another, don't forget ENTPACK.INI. Note that all the other files that the proram uses do not reside in the same place as ENTPACK.INI.
Chip's Challenge is designed only for keeping one person's scores at a time. If you want to have multiple people play the game on the same machine without potentially overwriting each other's scores, you probably want to use MyChips to create "personalized versions" of Chip's Challenge.
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Chip's Challenge FAQ : 
What is "boosting"?