Seeking a simple program ~ text to binary converter

[Hawksey]

Hi all
Wonder if anyone can help me out here.
I’m looking for a simple program that would covert a string of 48 x 0’s and 1’s in text format and write them to a simple 6 byte binary file.
It would need to run on windows XP in the background (dos mode?).
The input string and saving file name would need to be input via switches, ideally something like:

Program.exe /B 000000100000000000000000000000000000010000001001 /F C:\Myfile.bin

I’ve searched the net for hours but not come up with anything

Thanks

Phil