Use Properties|Executable-Property to change the ‘Executable-Property’ of the selected files. The ‘Executable-Property’ is a versioned property, but is only used on Unix(-like) platforms, where it defines whether the ‘Executable Flag’ should be set to a file or not.

Choose Executable if the ‘Executable-Property’ should be assigned to the file or Non-Executable to remove the property from the selected files.