While third-party extractors exist, IMVU Studio now allows you to directly import .CHKN files from the "Classic" creator mode to continue working on them in the modern environment.
The architecture of a .chkn file is fundamentally similar to a compressed archive, like a .zip or .rar file, but compiled with a specific encryption header or proprietary layout used by the IMVU client. A CHKN extractor works through a multi-step process:
If an item is glitching, tearing, or breaking in the IMVU client, extracting the compiled package allows the creator to inspect the precise files causing the rendering conflict. The Controversy: Intellectual Property and Derivation
The 3D geometry and wireframe structures of the item.
While the tool is sometimes viewed with skepticism by the community, there are several legitimate reasons why a 3D artist or developer might use a CHKN extractor:
The 2D images wrapped around the 3D models to give them color, depth, and detail.