Here are discussed some MS Windows specifics.
Checkout the source code of WebcamStudio in a folder. Alternatively you can use this command line:
svn checkout svn://svn.code.sf.net/p/webcamstudio/code/trunk webcamstudio-code
Open the project in NetBeans
java.exe -jar WebcamStudio.jar
There are a couple of specifics for the Windows porting: