DVDs Out

File extensions are very helpful to identify the type of file. Apart from helping the computer to map the file with the right program it also helps us in manually identifying the type of file before opening it. The file extension tar is used to indicate an archive file. Further the file extension class is usually linked with the programming language called Java. A class file is actually the compiled output which is saved after a java program is compiled using the compiler. These files cannot be opened unless the Java Virtual Machine is installed in your computer which can be downloaded from the Internet.