My friend has converted a picture in2 .dat 4mat i wud like 2 convert again in2 picture 4mat n c tat pic. How?

Start by learning English so we have a clue what the question is.

My friend has converted a picture in2 .dat 4mat i wud like 2 convert again in2 picture 4mat n c tat pic. How?
Go to control panel, click on the View tab in the "Folder Options",in the advanced settings uncheck the box for "Hide extensions for known file types". Now right click that picture %26amp; select the rename option, change .dat to .jpeg n ur done.