I can't extract S7 system.img using ImgExtractor 1.3.7

I can't extract S7 system.img using ImgExtractor 1.3.7.
When i try to extract S7 system.img using ImgExtractor 1.3.7 it freezes.
I waited 10~15 minutes but nothing happened.
How can i extract S7 system.img?

PC Specification
Acer Aspire V5-132
Windows 10 Home 64-bit Build 10586.318 (Release Preview Ring)
Intel Celeron 1019Y
Intel HD Graphics 3rd Gen Driver 10.18.10.4425
DirectX 11
RAM 6GB
HGST HDD 500GB

from xda-developers http://ift.tt/1qRC1Ev
via IFTTT