I have about 300 to 400 pictures in a folder which are considered to be as documents by my windows operating system. The pictures are in .png format I had to get Information on every one of them and need to relate them as documents with Preview, and that is working fine. But the Finder still does not identify them as pictures and because of that does not affect a preview in icon view. So I am looking for the application that will permit me drag entire documents into it and have it mass apply as .png file extension but still no help from anybody. So anyone has done it please provide me with name of application and processor to perform that it will be great help.