Next, in Targets > Info, define the Document Types fields with the relevant data for your file type. Under 'Assets.xcassets' in the sidebar, click on the + icon and under App Icons & Launch Images, select create a New MacOS Generic Icon.Īdd the correctly sized images to the empty squares. Open a new Project as a Document-based application, using the file extension of the file type you want to change. Substitute the app's binary inside its bundle for a hard link to the binary of the app you want to open the file.ĮDIT: This only appears to work in Mojave: in Catalina, there's some code-signing fatal crash.Select that app as the default for the file type.Create a new application in Xcode that contains the icon resources for the file type.
#CHANGE FINDER ICON MAC OS SIERRA HOW TO#
How to change file icon based file's extension (.txt. A canonic, detailed, up-to-date solution to the problem is required.
The alternative seems to be creating a 'dummy' application, though this does not seem to be fully described. Most solutions suggest hacking the ist and Resources of the application that opens the file type: in this case, Preview, and that's undesirable for several reasons - increased security around app's integrity, re-applying the fix after every update, etc. (Veteran Mac users may recognise the inspiration for my design, to which all are welcome.) I want to change the file icon for all PostScript files on my system to this: First up, there are several other posts here and on StackOverflow and SuperUser about this, but few of the answers are satisfactory, definitive or up-to-date.
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