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.

QFX file extension is a open financial exchange file generated by Quicken. It is used to store financial information. QFX files are based on XML format and usually contain financial transactions for certain accounts.

File Extensions are used to specify what kind of content is stored in specific file. There are thousands of different file formats and each of them uses one or multiple file extensions.

Files with Document File Extensions are used to store information about various documents

File Extension SVT is created by Torchlight game. Torchlight is a role playing game. SVT files store information like pet data, items, gold and other character info.

File Extension MSG is used to store messages created by Microsoft Outlook. Information stored in MSG contains actual e-mails with all related information including recipients and sender

File Extension OFX is an open financial interchange file format. It is used by financial instititutions to exchange information about financial transactions.