XnView Software

Hi )
Why in install process I can not set XnView MP on all file types ?
On site declared support over 500 file formats or over 500 file types , but I can not select all types after install , to use all , me need see extensions in open and custom registry file types , but if I not want use your product and do uninstall , in system is left everything that I chose , please , make installator with opportunity set all file types in install process )
Example in attachment , if so , I at least can remove application without garbage in the registry )

Hi, I am not quite sure whether my question is the same exact:

Installed XnView Classic, 2.51.5.0 64bit on Win10.
To select the file formats - see screen-shot, OK, just upload is not possible: all buttons are light grey and therefrom not to click at all - is not possible.
Even the right side scroll button is not possible to move.
(I started with Admin-rights.
But, I use my second Account to install, so not the Admin-Account. But which does not make troubles with many other programs.
But the installation I did not run as Admin.)
Thank You.

Screen-shot: