Howto create the Xvid installer
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1. Install Bitrock InstallBuilder Professional

2. Create a releasenotes.txt file in the current directory 
   with information about the release

3. Unzip wintools.zip

4. Generate autoupdate-windows.exe:
   BITROCK_INSTALLER_PATH\autoupdate\bin\customize build INSTALLER_PATH/project.xml windows

5. Start Bitrock InstallBuilder GUI and open "xvid.xml" project file

6. Make sure the Xvid version numbers are correctly set in Bitrock GUI (or xvid.xml) and update.ini

7. Click on "Build" in Bitrock InstallBuilder GUI