Detects presence of additional data at the end of .exe file. So can detect type of sfx-archive or detect type of installer.
Extra offset - offset of data
Extra size - size of data
Extra data - text comment for data
Extra error - is error occured during analysis
Detects these types of data: zip, 7z, rar, installers NSIS, Inno Setup, InstallShield. You can send your custom files to author, if they have some unknown data.