>Hit to 'the other purpose' :) Well I simply do :

Right!

>lnNumber1 = iif(lnNumber > 0x7FFFFFFF, 0x7FFFFFFF-lnNumber, lnNumber)

What I needed was that:

 number 0 translates to chr(0) 0x00 (not 0x80)
 number 1 translates to chr(1) 0x01 (not 0x81)
 ...
 number 208142404 to chr(12)+chr(104)+chr(0)+chr(68) 0x0C680044 
                (not chr(140)+chr(104)+chr(0)+chr(68) 0x8C680044)

It's a very simple UDF to get that, but bintoc() would have been even simpler.

Thanks again.