file replacement utility

vinitwins

Disciple
does anyone know of a utility with which i can replace part of a very large file with another:

say i want to change 250mb of a 5gb file (i should be able to specify the starting position/byte offset) with another 250mb file -- is there any utility with which i can accomplish this task? if not, any programming gurus in here that can compile such an application in vb/dotnet?

i don't want a utility that wastes disc space -- my 5gb file should be edited directly -- no dummy file should be created as that would necessitate the need for loads of free space on the hdd as i might need to replace chunks/portions of even 15gb files!!

thanks,

v
 
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