BeaEngine.lib is a library coded in C. It contains actually one function called "Disasm" which allows to disassemble any instruction from the intel instructions set for processors 32 bits and 64 bits. You can use this lib in C programs or asm ones. You can use it in ring3 or ring0 because it doesn't use the windows API. Th package you can dowload here contains the lib, the source code under LPGL3 license and examples including headers for C programmers, masm, nasm, fasm ,GoAsm and Python ones.