Converts eight characters in a string from Microsoft Binary Format to IEEE double format.
double = CvdMbf(a$ [,offset% = 1])
As CvsMbf but only eight bytes and MBF-Double (In GWBASIC the four additional bytes are only filled with zero, i. e. the same 6 digits)
CvdMbf() is the reverse function of MkdMbf().
Print CvdMbf("GFABasic") // Prints 1.69857741858609e-09
{Created by Sjouke Hamstra; Last updated: 27/09/2014 by James Gaite}