Right-click on any existing tab within the Tool Palette and select . Name it something recognizable, like Custom PKTs .
If you work with Autodesk Civil 3D, subassembly PKT files (subassembly composer outputs) are essential for creating custom corridor behavior. This post explains what PKT files are, why you’d need updated versions, how to find and safely download them, and best practices for installing and maintaining them.
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| | Likely Cause | Solution | |-----------|------------------|---------------| | “Cannot run subassembly script” message | Subassembly Composer version mismatch | Open and resave PKT in matching version | | “Missing a .DLL file” error | PKT created in newer Civil 3D version | Use matching Civil 3D version; backward compatibility isn't guaranteed | | “Invalid.pkt file. The packet is missing an .atc file” | File structure is corrupted or not from SAC | Only PKT files created with Subassembly Composer are valid | | Subassemblies disappear after corridor rebuild | PKT from newer version used in older Civil 3D | Update Civil 3D to match PKT creation version | | Cannot place custom subassemblies | Conflicting add-ins (e.g., Civil 3D Connector) | Temporarily disable conflicting add-ins | | Subassembly not showing in Tool Palette | Incorrect import method or file corruption | Re-import PKT; if issue persists, change SubassemblyName in SAC and re-export | Right-click on any existing tab within the Tool
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Finding and Using Updated Civil 3D Subassembly PKT Files Autodesk Civil 3D uses Subassembly Composer to create custom corridor components saved as PKT files. Finding updated, high-quality PKT downloads can significantly speed up your infrastructure design workflows. Where to Download Updated PKT Files 1. Autodesk App Store This post explains what PKT files are, why
Q: How do I use Civil 3D subassemblies? A: To use a Civil 3D subassembly, create a new assembly, add a subassembly, select the subassembly, and configure its properties.
: With the direct-link feature, you can now store PKTs on a server or in Autodesk Docs for easier team collaboration. How to Import Your Downloaded PKTs Open Tool Palettes : Right-click on a palette or create a new one. Import Subassemblies from the context menu. : If you want to keep your library organized, ensure the Link Directly to .PKT Files
* C:\ProgramData\Autodesk\C3D 20xx\enu\Imported Tools*
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