APK file extension is short for Androi Package. It is used to store information about Android deployment packages. APK files are usually used by Android and Google Play to deliver applications to Android devices.

In computing, DLL (an abbreviation of 'Dynamic Linked Library') is a file extension for executable libraries. DLL files are commonly used by software programs to store parts of the executable code.

Most frequent use of RAR extension is to store compressed information archived using RAR format. It is a proprietary compression format developed by Eugene Roshal. Compressing files is very useful when you want to transfer them over the internet since compression reduces amount of information to transfer. Also you may fit much more information on your PC hard drive if you compress information that you don't use.

The .BIN/.CUE image file format was developed by Jeff Arnold for the CDRWIN program. An image consists of two files which contain binary data and metadata, respectively. The filenames typically match (e.g. image.bin and image.cue). The .BIN file contains an exact copy of all data stored on an optical disc in raw, unprocessed form but without any subchannel data. For this reason, some programs use the .RAW suffix for these files.

PPS format is a PowerPoint Slideshow format. If you do not have PowerPoint, Microsoft has a free PowerPoint viewer. Use their download site to search for it. Another option is to use the free OpenOffice.org office suite. The presentation portion of the suite can both display and edit PowerPoint presentations.

Files with extension DWG are usually used to store two and thre dimensional data used in engineering. Typical examples of software which use this format is Autocad, IntelliCAD, Caddie and Open Design Alliance applications. DWG is short for drawing. The .bak (drawing backup), .dws (drawing standards), .dwt (drawing template) and .sv$ (temporary automatic save) files are also DWG files.

DAT file extension could represent following file types:

- Data file

- A data file extension used to designate an error message in a inbound internet email message (Microsoft Exchange Server v 5.0)

- WordPerfect Merge Data

- Extension used for some MPEG files

- Yahoo Messenger archive file

JNLP is short for Java Network Launching Protocol. This format is used by Java to download and launch applications over the network. JNLP applications typically don't run from user internet browser.

A file with the extension .dmg (an abbreviation for disk image) uses a disk image format commonly found on Mac OS X. The format allows secure password protection as well as file compression and hence serves both security and file distribution functions.

Microsoft PowerPoint (file extension PPTX) is a presentation program developed by Microsoft. It is part of the Microsoft Office system. Microsoft PowerPoint runs on Microsoft Windows and the Mac OS computer operating systems. It is widely used by business people, educators, students, and trainers and is among the most prevalent forms of persuasion technology. Beginning with Microsoft Office 2003, Microsoft revised branding to emphasize PowerPoint's identity as a component within the office suite. Microsoft began calling it Microsoft Office PowerPoint instead of merely Microsoft PowerPoint. The current version is Microsoft Office PowerPoint 2007. As a part of the Microsoft Office suite, PowerPoint has become the world's most widely used presentation program.

ZIP file extension is used for archive files compressed with DEFLATE algorithm of lossless compression.