MathXpert is a system that allows a person to do mathematics on a computer screen in much the same way as it is done with pencil and paper, but with some important differences:
(1) It is not possible to make a mistake.
(2) If you do not know what to do, MathXpert can help you.
These features of MathXpert should be compared to the two main difficulties that people experience in their attempts to learn mathematics:
You have to be very careful in mathematics, because a slight error can throw you completely off track.
Mathematics is cumulative. You must master each part of the subject before moving on to the next part.

The portable app does not require installation. Make as many copies as you need. Carry it in a flash drive and use on any computer, even without administrator access. No change of any setting on the host computer. No more conflicts with other applications. No more 'hijacking' of file types.