Yes it will work with some of the SR3 models. If you look at the third post you will see it has screenshots of SR4 characters followed by some SR3 characters.
SR4 Character Mesh Viewer
If you look at the 'Usage' section of the first post you will find it lists instructions for SR3 and SR4. However, the software does have limitations and will not work with every model. If I get more time I would like to do some updates to the software in the future but I don't have anything at the moment.
Oh please , thought this project was done . like , retired . with your tool i was able to extract some haircuts and clothing and i made them importable to 3ds max and blender , thanks a lot