and opening of MDF and SIS files in Windows serves as a nice free platform for those who want to have a detailed database of file extensions and information to fix file extension related errors. In file extension’s free library you can get detailed database of the most popular file extensions and other information related to fixing of errors and other aspects of file extension. Here at, a detailed database of the most popular file extensions can be easily obtained and the other information are also very useful for those who want to get ample knowledge related to file extension.


Though a detailed database of a large number of file extensions can be achieved from the library, here we would talk about file extension MDF and file extension SIS and the problem related to their opening in Windows.

File extension .MDF

If you are facing problem in opening MDF files in Windows, it’s possible that you may have registry related error or don’t have installed an appropriate program. It is strongly recommended to run a free registry scan for related errors. You need to install Alcohol 120% to open .MDF files.  File extension .MDF also related to SQL Master Database files as well as Menu Definition files.

Alcohol Disc image files have connection with file extension .MDF that are considered precise copy of data found on a CD or DVD. You have download or install Alcohol 120% application to open these files. You must scan your system first to avoid and identify related errors.

File extension .SIS

Just like file extension .MDF, if there is problem to open SIS files in Windows, it can be an indication that you don’t have installed an appropriate program or there is a registry related error. It is strongly recommended to run a free registry scan for related errors.

File extension .SIS helps to install application that is used for Symbian operating systems. Usually, Symbian operating system is used through a wide range of mobile phones and it can also be seen in a large number of new cell phone brands.

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