Thank you for your replies. The problem with not saving the paths is gone... to be exact, i think i didn't hit the "save" button. After clearing the LocalAppData folder, it works fine.
But i am still not able to get the preview to work. I moved the LDFind folder from C:\LDraw\Tools\LDFind to C:\Program Files (x86)\LDFind, but nothing changes. If i rename the LDVLib.dll, i get an exception error message, so the application is definitively using it.
But i am still not able to get the preview to work. I moved the LDFind folder from C:\LDraw\Tools\LDFind to C:\Program Files (x86)\LDFind, but nothing changes. If i rename the LDVLib.dll, i get an exception error message, so the application is definitively using it.