Translations:System Settings/File Associations/9/en

From KDE UserBase Wiki

In the General tab you can change the icon associated with this type of file by clicking the icon button in the top left of the tab. You can add or remove file name patterns in the Filename Patterns list, thereby defining which files are recognized as having this type. The Application Preference Order list in the bottom part of the tab names the applications that will show up in the context menu, when you right click on a file of this type. The first application in the list is the one that is used when you left click on the file.