If you modify an asset, do not upload it with the original creator's KUID. Update the KUID user ID to your own unique number to prevent overwriting the original file for other users.
While the native Trainz Content Manager does an excellent job of importing and exporting .cdp files, it does not easily let you glimpse inside an uninstalled archive. A standalone conversion or explorer tool becomes necessary for several practical reasons:
The 3D models ( .im , .trainzmesh ) and visual skins ( .texture , .png , .tga ). trainz cdp converter
Modifying Trainz assets is a highly rewarding aspect of the hobby, but it comes with responsibilities:
: You cannot directly convert a CDP file into a 3D model (like .obj or .fbx) for external editing. CDP files are compressed data packs, not 3D source files. If you modify an asset, do not upload
: Many older assets (from Trainz 2004 or 2006) won't install directly into Trainz 19 or 22 due to "obsolete" tags. A converter can automate the process of updating the config.txt file within the CDP to meet modern standards. Batch Extraction
def list_cdp_contents(cdp_path): try: # CDP files are structurally similar to ZIP files with zipfile.ZipFile(cdp_path, 'r') as zip_ref: print(f"Contents of cdp_path:") for file in zip_ref.namelist(): print(f" - file") except zipfile.BadZipFile: print("Error: This CDP is encrypted or uses a format not compatible with standard ZIP tools.") A standalone conversion or explorer tool becomes necessary
Common issues and fixes
Dedicated route builders often deal with thousands of assets. Extracting CDPs into organized local directories makes it easier to catalog dependencies and back up custom creations without launching the game. How to Convert and Extract CDP Files