The MyFinance module solves three major problems:

1) A procedure to calculate percentage returns for a price matrix in Maple.

2) Get data straight into Maple from both http and https urls*
pointing to a csv file (Maple's HTTP:-Get() only works with http at best)
(This core code for this procedure was written by Axel Vogt)

3) A CleanData procedure. Empirical financial data
(especially free data) is know to have "outliers" that can distort
the calculations. This procedure nullifies such observations.

Copy the two files (.mla and .hdb) to maple's lib folder ie in my
case C:\Program Files (x86)\Maple 16\lib then you are set to go!

* Note this procedures uses  C:\\WINDOWS\\SYSTEM32
However I have a 64 bit computer and it still seems to works for me :-)