Double Class replacement library

I'm trying to use Marcel Leutenegger's double class of approximations ( http://documents.epfl.ch/users/l/le/leuteneg/www/MATLABToolbox/DoubleClass.html ) on a 64 bit widows 7 machine with R2014b. I know it's 7 year old software, but I have an application where a bit of savings on a few functions (tan, exp) will save me a ton of time.

Except ....I can't seem to get access to most of the interesting functions that would really speed up my code.

Some of the replacement functions are in m files and some are in dll's. After I add the appropriate path I can see the m replacements, but not the dll's.

>> addpath('C:\Users\Me\Downloads\DoubleClass'); >> which cot C:\Users\Me\Downloads\DoubleClass\@double\cot.m % double method >> which exp built-in (C:\Program Files\MATLAB\R2014b\toolbox\matlab\elfun\@double\exp)

Ideas welcome.