Hi, i need to change flags for one PE section during executing file.

Problem is that block of memory is read-only on NT.

It also has to work on all winodows versions (95 and later)

I could use VirtualProctectEx to allow write to the memory... but is someone aware of some better solution?

thanks

VirtualProtect(Ex) *is* the best solution - it's documented and works on both 9x and NT. You won't be able to change the pagetables directly anyway. If you want to do it with syscalls, you'll end up writing a lot of different versions (9x, NT, NT-with-SYSCALL-instruction and so on).

If your concern about calling VirtualProtect is from a security point, don't bother. It's easy to set a memory-range breakpoint.