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File extension awareness is important to prevent you from downloading potentially dangerous files. There are many kind of file extension that we can find on the computer world. We can know what kind of file and how to open it by looking their file extension. File extension DOC probably could be the most commonly used by computer users. File extension DOC is created using Microsoft Word for Windows application. If you want to know about certain file extension then you can online on the Internet. You can visit file-extension-library.com to get more information about certain file extension. There you also can get information what application or computer program to open the file.