INF file format is used by so-called information files, in plain text format, and used in Windows systems for software, drivers, or update installation processes. INF file stores structured data related to files that should be copied, information about driver version, register entries to be added or modified, and various other information, such as creation date, version number, or author.

INF file data is stored in plain text format; INF file are used by device and Windows software installers. Data stored in INF file typically describes folder and installer files location.

Location of INF files

INF files are commonly included in installers and installation packages for Windows applications. INF file are also included in software update packages, and such INF file store default settings, device configs, and logs.

One of the most known INF file is Autorun.inf file stored on mass storage devices which defines which programs should be run after mounting the device. Windows systems older than Vista did not monitor such devices for viruses and therefore such INF files could be used as a malware infection vectors.

INF file structure

Structure of INF file is resembles closely that of INI file since both formats define actions divided into sections. Each INF features a [Version] section that contains Signature describing Windows version for which the INF file is dedicated. Other sections are mainly user-defined and store information related to defined components.