Did you get some file with .lit extension while you were testing something or in some work-around?
Okay! Here is the method for opening the .lit files.
.lit file is a format from Microsoft Reader, which is Generally for an e-book reader, available for the mobile phones as well as for the desktops.
The easiest way to open .lit files is to download the Microsoft Reader and use it. But it will only work on Windows Operating Systems.
If you want .lit files to be opened on Mac or Linux, then you will need to download a small program called ConvertLit. ConvertLit converts the .lit file to the open file formats. ConvertLit is also available for the Windows Operating Systems.