Ah thought it was raf files but that only works for single player replay.
His program is an insim app, it gets the data from lfs(lap times for example)
And store's then saves the data.
You dont need to crack the mpr format unless you want to
go into the doc's folder and open the insim text file. Now write your app!
struct IS_LAP // LAP time
{
char LAP [4];
char UName [24]; // username
char PName [24]; // nickname
char CName [32]; // car name
MSHT Time; // lap time
byte PlyNum; // player's number
byte UniqueId; // player's assigned unique id
word VerifyId;
};