How to find/remove file associations for a certain program in KDE

I had a program installed on my Kubuntu system that was able to open a lot of different graphics file types and registered as default program for many of those file types. I have unistalled the program, but in the file associations it is still present and every now and then as I try to open a file from the file manager, it tries to launch the no longer existing program. I could remove that association for the most often used file types via the file associations dialogue in KDE's settings menu. Unfortunately, in this dialog I can only search for a file type and see/edit the associated programs, but in this case, I would need to search for the program and see all file types that it is associated to. Is there a way to achieve this? If not via the settings, maybe in some config file, where I can just remove all hints to that program?