If I load a .kpp, change its icon and save, I'm presented with the save location and the file name now has "kra" appended to it. If I change that to ".kpp" and save, I get the option to replace the existing file, and on clicking "Yes" brings up the message "Could not export file: the export filter is missing".

It's been a while since I customised an icon so I'm not sure if this is a recent bug or I've just forgotten how to do it.

I will check it... I thought I had finally fixed this issue, and the stupid thing is, it's the file dialogs that are causing the problems, together with Qt's internal database of filetypes. Which OS were you on again?

Windows 10 64-bit.