The IDA Pro Book, 2nd Edition

IDA TIL Files

All datatype and function prototype information in IDA is stored in TIL files. IDA ships with type library information for many major compilers and APIs stored in the <IDADIR>/til directory. The Types window (View ▸ Open subview ▸ Type Libraries) lists currently loaded .til files and is used to load additional .til files that you may wish to use. Type libraries are loaded automatically based on attributes of the binary discovered during the analysis phase. Under ideal circumstances, most users will never need to deal with .til files directly.

Loading New TIL Files

In some cases, IDA may fail to detect that a specific compiler was used to build a binary, perhaps because the binary has undergone some form of obfuscation. When this happens, ...