Converting Microsoft Binary Format to iEEE format Using VB 6

I wrote an accounting package back in the late 80's, early 90's that began back with GWbasic and so on upto Professional Development System ver 7.10. All the Data that was saved to random accessed files using the old unsupported Microsoft Binary Format (MBF). 10 years later the firm now wants me to develop a windows version of the software. I've come to a snag in development right from the start where MS VB no longer supports the MBF format. There are 3 function I need, they are CVI (integer), CVS (single), CVD (Double), these convert MBF strings to thier respected ieee Decimal format. I've been searching the net for about a week trying to find a method to do this and have come up against a brick wall. if anyone is able to assist me in my problem please feel free to add your advice. Anything is better than what I've come up with so far.

Thanks
Russ