.UI File

File extension ui is commonly used for files that contain saved custom user interface settings. Mostly plain text or XML files. Used to customize the look of programs, sometimes includes whole skins and themes.

Files with ui suffix can be commonly found as various user interface settings. Used in many programs, but not standardized file type.

How to open:

Most of these files are XML based, thus can be viewed or edited using any text editor.

How to convert:

It is highly unlikely that you can convert .ui files to anything else.