Download Siscontent software in your pc here
Go to File and click on Open (Ctrl + O) or just click on Open Pkg Button on Siscontent
Choose your sis format file.
Click on Extract file...
Copy all folder's (Note:- Do not Copy .pkg file)
Paste your copy folders in your pc and close the siscontent and other open window.
Congratulation You have successfully Extract your apps or Widget via Siscontent.