Got it after some playback.
Please note that you need the latest version of CC.NET, I think version 1.4.3 or later. This is from 1.4.4 SP1.
I first tried 1.4.0, but the ModificationReader task does not exist in older versions.
<cruisecontrol>
<project name="WatchSandboxContinuous" queue="TestQ" queuePriority="4">
<triggers>
<intervalTrigger/>
</triggers>
<sourcecontrol type="your_source_control_type">
...
</sourcecontrol>
<tasks>
<modificationWriter>
<filename>mods.xml</filename>
<path></path>
<appendTimeStamp>True</appendTimeStamp>
</modificationWriter>
<nullTask />
</tasks>
</project>
<project name="BuildSandboxContinuous" queue="TestQ" queuePriority="3">
<triggers>
<projectTrigger project="WatchSandboxContinuous" />
</triggers>
<prebuild>
<modificationReader>
<filename>mods.xml</filename>
<path>C:\Program Files\CruiseControl.NET\server\WatchSandboxContinuous\Artifacts</path>
<deleteAfterRead>True</deleteAfterRead>
</modificationReader>
</prebuild>
<tasks>
<modificationWriter>
<filename>mods.xml</filename>
<path></path>
<appendTimeStamp>True</appendTimeStamp>
</modificationWriter>
<nullTask />
</tasks>
</project>
<project name="BuildSandboxFull" queue="TestQ" queuePriority="2">
<triggers>
<multiTrigger operator="And">
<triggers>
<projectTrigger project="BuildSandboxContinuous" />
<scheduleTrigger buildCondition="ForceBuild" time="23:00" />
</triggers>
</multiTrigger>
</triggers>
<prebuild>
<modificationReader>
<filename>mods.xml</filename>
<path>C:\Program Files\CruiseControl.NET\server\BuildSandboxContinuous\Artifacts</path>
<deleteAfterRead>True</deleteAfterRead>
</modificationReader>
</prebuild>
<tasks>
<nullTask />
</tasks>
</project>
</cruisecontrol>
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