Extracted folders, or converted .cdp2 / .cdp3 formats upon re-export.
Extracting large numbers of CDPs at once allows you to organize your custom content library without bogging down your active game directory. trainz cdp converter
Even when using third‑party converters, you’ll often fall back on the official tools for certain tasks. Here’s how Content Manager handles CDPs: Extracted folders, or converted
If you were asking for the actual "text" (code) to handle CDPs programmatically (e.g., a Python script), .cdp files use a proprietary format. However, because they share similarities with ZIP/JAR archives, you can often treat them as compressed archives in code. a Python script)