With the continuous development of processor technology, the 64-bit operating system came out. Later on, the 64-bit applications began to spread widely too. In the field of reverse engineering (i.e.: software cracking), the classic and traditional OllyDbg can only perform reverse analysis on 32-bit applications. At this time, you need to know there is another debugging software that specially designed for analyzing both 32-bit and 64-bit programs - x64dbg.