This format works based on the main compression algorithm LZMA. It was originally used in 7-Zip archives. Other compression algorithms can be used in 7z since this format has open architecture for developers. It has a high compression coefficient. The encryption algorithm is AES-256.

This is an archive created in the WinAce program with it’s own compression algorithm. It can have practically an unlimited size. It has a high level of compression and high compression speed. It’s used in both the latest versions of Windows and in Mac OS X.

This was developed by the Adobe Company and contains data regarding the metric characteristics of Type 1 PostScript fonts. The AFM structure requires a control template that defines the look of every font symbol. It’s used primarily for UNIX.

This is a compression format created by Korean developers. It uses a compression algorithm similar to ZIP, and optimized for compressing large file sizes. It supports self-extraction and component archives. ALZ files are decompressed and created in the ALZip tool.

This is an obsolete file archive format. It can store several uncompressed or compressed files in one archive, which can be decompressed with the help of a special tool. It was the forerunner to the ZIP format. It was used in MS-DOS and Macintosh computers.

This is an archive with files compressed with the help of the ARJ algorithm. It supports long file names; file management splits data into several files by size to protect data integrity. It was originally developed for earlier versions of Windows and DOS. Currently a version with open source code works with almost 10 different operating systems.

Is an e-book format created for Amazon’s Kindle8. This format supports the CSS3 pop-up text system and HTML5 as well as built-in fonts; moreover, it possesses powerful document-formatting capabilities. It contains a function of independently activated DRM protection. AZW3 books can be created with KindleGen, a free software program from Amazon.

This is an archive file used on Macintosh computers. It stores branched resources and data in the file system as one file. It includes the storage of fonts and convenient loading of data with Macintosh to the Internet to be transferred to other Mac devices. It’s used to import PostScript Type 1 program language data.

CAB – Used for compressing files in the Microsoft Windows OS. The archives are used in OS installation packets (Windows Installer, AdvPack, Device Installer, API) and supports digital signatures. The format uses three compression methods depending on the specific archive.

This is a format for compact font storage in the OpenType system, allowing for the rasterization of text information. It differs from TrueType in its abilities to describe font symbols and with its font structure variation algorithm, depending on the change in size. CFF allows for increased screen clarity with high resolution, but this is not due to the font, but its rasterization.

This is a format for presenting fonts in PDF files that was initially conceived to store symbols in the Japanese and Chinese languages because it had a 16-bit structure and allowed for more precise adjustment. CID expands the the potential for PostScript by supporting languages that do not have a left-to-right orientation, and by supporting even a vertical mode of orientation.

A file compression format that is created in a corresponding tape archiver. It’s still used in the Linux version 2.6 kernel and the 'pax' archive installer from Apple. The archive contains header information with data about access privileges, the owner and time of creation. It was created to store back-up data on tape drives and other tape devices. These days Oracle developers deliver much of their software in CPIO format.

This is a compression format used for Debian packets and other Unix systems. It’s represented as packaged binary files containing information about author privileges, format version numbers, configuration data and other documents needed for installing programs from a packet.

This was created for the Mac OS X operating system. Unlike the old operating environment versions, the font is stored in the thread of a data file instead of in resource threads. It’s been used as a container for TrueType fonts since 2009 after the release of Mac OS X 10.6, and is gradually replacing the TrueType Collection.

Is a format developed by the International Digital Publishing Forum. It is characterized by the XML- and XHTM-based optional use of CSS styling. The main feature of this format is the use of reflowable text (word wrap) which makes it possible to adapt the image to different device displays. The ePub file is a zip-archive with an .epub extension.

Is based on the XML format. Its main tasks are: precise display on a variety of devices, full preservation of document structure, ability to be transformed into other formats. Unlike other popular e-book formats, fb2 does not specify the appearance options for different devices’ displays. The format employs tools to indicate the different parts of the book – verses, epigraphs, quotations.

This format is a Java archive and is presented as a typical ZIP file, in which part of the program is written in Java language. It was gradually replaced by new mobile platforms, since JAR is used for launching applications and games on early generation mobile phones. They can contain a digital signature, and they’re actively used in popular browsers for storing supplements.

For archiving with files compressed based on the LHARC algorithm. It’s a popular archiving format on Amiga computers. It’s used for compressing installation packets on earlier games. Later it was replaced by the LZH compression format. Currently LHA is still distributed in Japan.

Is a format developed by Sony for its proprietary Sony Reader devices. Files in this format may contain text and images. The format is XML-based.

Is a format used in the MobiPocket Reader software on desktop and mobile platforms. Books in this format can have .prc and .mobi file extensions. MOBI was originally based on the PalmDOC format; adding HTML tags made it possible to create a high-compression version which compresses data to a high degree. There are a number of formatting restrictions – the text cannot be indented, and inserted tables and images cannot be formatted.

A format for displaying and storing OpenType fonts. It can be scaled without losing font quality. Today the OTF library has more than 10 thousand fonts. Practically all fonts known today have an OpenType version. The format was based on Postscript and supports Unicode. It was initially developed by Microsoft, but today it belongs to Adobe.

This format was used for storing databases on the Pegasus and Palm PDA devices. Besides images, PDB allowed you to store tables, maps, e-books, and other data in a structured way. Today it has become obsolete and has been replaced by more flexible formats with DRM protection.

This is a 7-bit font format used for directly downloading to a PostScript printer. It has two character encoding in hexadecimal. It has good compatibility with multiple font formats. PFA contains an outline for font symbols and is formatted in ASCII text data.

This format was developed to simplify use of Type1-fonts in some software. It’s 8-bit and so it’s quickly processed by programs and it has a compact structure. PFB contains additional metadata. Besides the storage of system fonts, a good example of its use is its application in AutoCAD to create font files with compilation.

This format is used to store templates and designs in PageMaker 3. PT3 allows for a set of font descriptions, and for the layout and graphical elements to be stored in PostScript Type 3 format. This container is used as an editable file to meet publishing needs, and was created in a program for the PageMaker layout.

This is one of the most common file compression formats. It was created by Russian programmer Evgeny Roshal. The format allows one to break up an archived file into several parts, to block an archive to prevent accidental modification, and to enhance data recovery (helps to renew a damaged archive). It has a 128-bit AES algorithm.

Was developed for the first mass-produced e-book reader – Rocket eBook. The format is written in Ruby. RB files are containers holding the entire content for a Rocket eBook device. It has DRM protection capability which is not used in the books published at present due to the format’s lack of popularity.

This archive format is used as an installation packet in the Unix operating system for updating, querying, checking, deleting and installing software products. The RPM archive is a database that is comprised of a single base of program packets and a large number of small databases. The system can store information about packet modifications, deletions and installations.

This is a format for storing raster and vector fonts created or changed in FontForge. By opening an SFD file in this program you can store it in any modern font format like TrueType or OpenType. SFD contains all the information about the point setting of each symbol created or changed in FontForge.

Is a format developed for the Shanda Bambook e-books, and is exclusive to those devices. Certain e-books produced by other companies can also view documents of this type. Shanda released its latest device in 2011 which is why this format is not widely used at present.

This is a format for storing and presenting text information. It’s also referred to as CID 2 and is basically used for imaging and creating complex fonts in PDF. It’s based on the TrueType system, but allows for more precise adjustment and allows for refined writing due to a 16-bit structure that is very important when displaying Asian language symbols.

Type42 was based on the PostScript language for displaying TrueType fonts. It allows for printing all TrueType fonts on PostScript printers and allows for rasterization when displayed. All changes in font structure occur with PostScript procedures. It supports multibyte TrueType fonts in Chinese, Korean and Japanese.

This is the standard format for data compression in a Unix environment. It’s used to store several files in one archive and for creating a file system archive and for software distribution. In a TAR archive, information is logged about the owner, file groups, catalog structures and file timestamps. Different bzip2 and gzip tools are used to create an archive.

The most complete version of the TBZ archive. It’s created with the help of the Bzip2 utility. It was created for use in Unix systems. The TAR container combines several files into one archive that’s placed in a TBZ compressed file.They’re used as installation packets in the installers of some operating systems.

Is an e-book format developed for the Psion Series 3 platform used in the 1990s. It contains text and its formatting parameters. This e-book format was used exclusively in Psion devices.

A compressed file which is a TAR archive. Created for use in Unix systems. The TAR container combines several files into one archive that is placed in a TGZ compressed file. They’re used as installation packets in the installers of some operating systems.

This is a standard TrueType font format developed by Apple Computer in 1989. The advantage of TTF till now has been its high level of font display control right up to the pixel. It has a vector format so it’s easy to scale. Today TrueType is used in operating systems from Apple to Microsoft.

This is a format for storing raster images, developed by the Ulead Company. It can include several edible layers, like in a Photoshop document. The image raster format was transferred to the TrueType font system and allows for the presentation of graphical information in a text format.

It belongs to TrueType and OpenType font formats and has analog compression that stores rendering technology. In WOFF it’s possible to store individual metadata with font info. It’s been used since 2010 for the main purpose of storing and transferring fonts on the Internet. It was developed by the Mozilla Foundation.

A common format for compressing data. It’s used by a large number of applications for the exchange of data, back-ups and file compression. In ZIP archives they use various compression algorithms. The cryptographic algorithm is proprietary, so confidential data is better stored in an archive with a more complex protection system (RAR, 7z, etc.).