MKV file extension is used for files in Matroska multimedia container format. Matroska file format was created in 2002 based on the Multimedia Container Format. Matroska format and MKV file is widely popular storage format for multimedia files on the internet.

Office Open XML (also referred to as OOXML or Open XML) is an ISO/IEC standardized ZIP-compatible file format originally developed by Microsoft for representing spreadsheets, charts, presentations and word processing documents. Starting with Microsoft Office 2007, the Office Open XML file formats (ECMA-376) have become the default file format of Microsoft Office.

A STEP file is used to store 3D models formatted in an ISO 10303-21 standard for the purpose of the exchange of 3D product data. It contains three-dimensional data in a format that can be recognized by various programs.

A Subrip format, or SRT, is a subtitle file that can be read by video playback programs such as Microsoft Windows Media Player and Apple iTunes. The name of the SRT files often reflects the language of the subtitles with different abbreviations, such as ENG for English or ES for Spanish.

A file with an STP extension contains the 3D object project that meets the standards of the STEP format (Standard for exchanging product data). STP files are similar to STEP files in terms of structure and format, STEP is just less used.

PDF is short for "Portable Document Format" which was created by Adobe Systems in 1993 to facilitate document exchange. After creation of the internet this format experienced significant growth and became de-facto standard for document exchange on the internet.

Office Open XML (also referred to as OOXML or Open XML) is an ISO/IEC standardized ZIP-compatible file format originally developed by Microsoft for representing spreadsheets, charts, presentations and word processing documents. Starting with Microsoft Office 2007, the Office Open XML file formats (ECMA-376) have become the default file format of Microsoft Office.

CFG file extension is used by files storing various kinds of configuration information. CFG files are frequently referred to as configuration files. Configuration files can store various parameters, settings and start-up information used by applications or operating system.

JavaScript Object Notation (JSON) is a format used to store structured data in JavaScript derived data format. JSON was designed by Douglas Crockford while his work in State Software. JSON at that time was designed to exchange application state information between web application and back-end server.

A file with DXF extension (acronym for Drawing Exchange Format) is a file format for CAD design drawings that belongs to the AutoCAD program group, and is used to save the drawings created by those programs. This type of files allows interoperability between the DWG files, proprietary file format of the AutoCAD program, and the rest of the programs on the market, proprietary or license free.

The ZI extension represents the popular ZIP file, with a different name, to avoid mail and messaging server filters. Within the archive, there is at least one single file of any type.

MUI, or multilingual user interface files are language resource files used by Windows operating systems as of version 2000 and above, and allow the interface to display different languages. While files with the MUI extension are usually associated with the Windows interface, they can also be created by Open GL tools.