Files with the extension .sis are used to install applications, games and other software into Symbian OS-based mobile phones like Nokia, Sony-Ericsson, and Motorola. The installation is done from a PC with the use of an accessory data cable or through infrared or Bluetooth technology.
Most users have encountered files they have yet to see or recognize at least once during the entire course of their computer activities. With the easy accessibility of computers nowadays and the number of infectious computer viruses being created out there, it is only right for users to be capable of properly identifying unknown files and save their computers from being temporarily or permanently damaged.
A document file with the .doc extension is the most widely popular and commonly used document format at present. It has been developed constantly by Microsoft as their standard word processing format found in their Word application among Microsoft Office’s list of programs.
Files with the DOCX extension are default output documents created with Microsoft Word 2007. This is the new file extension used by Microsoft Office as a result of its binary file format to XML format transition.
The file extension AMR is the speech-encoding format used in mobile phones or GSM telephony. It uses an AMR coder to lower down the compression rate while the cellular interference increases. Errors while using AMR files will be rampant without the proper coder.
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