Você entende de programação em linguagem C e C++? Se a resposta é sim, dê uma olhada no código fonte do Win98 que eu consegui.

/*
TOP SECRET Microsoft(c) Code
Project: Memphis(tm)
Projected release-date: Summer 1998
*/
#include "win31.h"
#include "win95.h"
#include "iexplorer.h"
#include "evenmore.h"
#include "oldstuff.h"
#include "billrulz.h"
#define INSTALL = HARD
char make_prog_looks_big[1600000];
void main( )
{
while(!CRASHED)
{
display_copyright_message( );
display_bill_rules_message( );
do_nothing_loop( );
if (first_time_installation)
{
make_50_megabyte_swapfile( );
do_nothing_loop( );
totally_screw_up_HPFS_file_system( );
search_and_destroy_the_rest_of_OS/2( );
explode_linux( );
hang_system( );
}
write_something(anything);
display_copyright_message( );
do_nothing_loop( );
do_some_stuff( );
if (still_not_crashed)
{
display_copyright_message( );
do_nothing_loop( );
basically_run_windows_3.1( );
do_nothing_loop( );
do_nothing_loop( );
}
}
if (detect_cache( ))
disable_cache( );
if (fast_cpu( ))
{
set_wait_states(lots);
set_mouse(speed, very_slow);
set_mouse(action, jumpy);
set_mouse(reaction, sometimes);
}
/* printf("Welcome to Windows 3.11"); */
/* printf("Welcome to Windows 95"); */
printf("Welcome to Windows 98");
if (system_ok( ))
crash(to_dos_prompt);
else
system_memory = open("a:\swp0001.swp",O_CREATE);
while(something)
{
sleep(5);
get_user_input( );
sleep(5);
act_on_user_input( );
sleep(5);
}
create_general_protection_fault( );
}