A very useful feature when recoverying files is to recover just the required ones, based on file extension. With this, catagories of files can be either recovered, or skipped. Two simple examples could be to recover all photos, or recover all files that where not programs.
To recover all photos, either the JPEG option could be selected, or All Images could be selected. In many cases, the result will be the same, but All Images will also recover BMP files, and other known image formats, such as specialised camera formats
The Select all buttons are for quick selection of various types of files. The actual extensions they select are listed below
Select all images
JPG and JPEG
BMP
GIF
TIF and TIFF
Select all movies
AVI
MPG and MPEG
MOV
Select all programs
EXE
COM
DLL
OCX
Select all sound
MP3
MP4
WAV
WMV
The lower list box is used to enter any other extensions, up to 15 characters in length. To add a new extension, use the Add extension button, and then enter the text.