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RealFlow | Cinema 4D uses the RPC format (“RealFlow Particle Cache”) for its particle files. These files are fully compatible with RealFlow's standalone version, but also with the RealFlow RenderKit and the Connectivity Plugins. Both tools are available from your customer account on realflow.com.
Meshes are stored as ABC files (Alembic). These ABCs can be loaded with Cinema 4D, RealFlow standalone, or any other application with Alembic support.