Comment 9 for bug 846384

I dont see how sticking the file type extention will help the users workflow or smoothness, this is no way helps a user to identifiy what will open the file.

The reporter says his mother cant tell the difference between the previewed files, will adding the extention to the preview really help with this? There a many types jpg, png, gif, ps, pdf, tif, bmp, etc adding each of these to the file preview is not going to provide much benifit if the user does not already know what these mean, and if they do there is no issue to begin with.