The file extensions DMG are shaped by Apple Computers. They are employed for the Mac operating system. You have to know that these files are nothing but disc image ones. They are in reality nothing but contents of a CD/DVD which are compressed in this format. This format can be converted again into CD/DVD by the application of free software.
One of the best benefits of DMG files is that they are usually secluded by passwords. Just change a DVD into a DMG file and fasten it adequately. You can then prevent others from watching without your knowledge. You can say that DMG files are packed in versions of CD or DVD. You can see that they are smaller than the size of the disc, though they contain the same information. This is an enormous advantage of the DMG extension.
The acronym for Software Installation System is SIS. The file extension SIS is an archive for the Symbian OS. It is wrongly believed as an application file, though it is not so. It is interesting to note that this extension can be created in more than one way. It is important to note that it can be installed on a compatible phone. All you have to do is to use the phone's communication software just as a method to transfer the file to the phone. It is possible to open the SIS format on the phone to run the installer.
It is to be known that SIS extension is widely used in the case of mobile devices such as Palm PDAs and Nokia. These extensions are also used Motorola and Ericsson mobile phones as well. The extension is one of the most widely used formats.
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