Tiniet portable executable

[felipe]

I don't know that game.If you want a challenge what about making a program (doesn't matter the size) that process tiny files that have "the smaller code possible" to tell the program what action to take  :idea:? Now, that's interesting...

[Siekmanski]

Welcome to the forum.  :t

I just got inspired from that .kkrieger game (96 KB) and wanted to dive in this adventure of creating a small, useful executable. The game itself states "macros are allowed", and this specific macro I'll create is the most used one; the so-called "auto potion"; just presses Q, W and E indefinitely.

I understand the suspiction, though. I could quickly code a C program to do that. Just wanted some challenge.

Isn't that the Farbraush production where they tested the first kkrunchy packer?

[Jean-Marie]

I remember Peter Ferrie had made an article on the smallest possible executable, but I can't find it back.
I found this page which explains where to insert some code in the header section.
http://pferrie.000webhostapp.com/misc/tiny/pehdr.htm
This can be helpful.

[zedd151]

.... which explains where to insert some code in the header section.
This can be helpful.

Which will also set off alarm bells from AV software.

[aw27]

This was all discussed in the AM thread.
It is also not possible to modify PE headers with MASM, you need to use a clone like UASM.
With UASM we can obtain a small .exe of around 200 bytes able to run on win xp, vista, 7 and 10.
We made experiments to make the .exe as small as 103 bytes but it failed to run on more recent OSs.

And we have also explored how small a 64-bit .exe we can obtain.

BTW, we can also make small .exes in C with about 1KB, I think with talked about that as well in the AM thread (or in another).