this dialog requires the CadTranslators to be installed.
The setup lies next to the PS setup on GTAC-Server.
Btw: if you just want to load a monotlitic JT-file, there is no need to translate.
1. Set your sysroot-path
2. add a folder xyz.cojt under sysroot and put your JT-file into it
3. use button "Define Component type" in PS to set the required class on your part
Now you can D&D it into your study.