Xojo Developer Conference
25/27th April 2018 in Denver.
MBS Xojo Conference
6/7th September 2018 in Munich, Germany.

Platforms to show: All Mac Windows Linux Cross-Platform

FAQ.How to open icon file on Mac?
Answer: Use the NSImageMBS class like this:
dim f as FolderItem = SpecialFolder.Desktop.Child("test.ico")
dim n as new NSImageMBS(f)

window1.Backdrop = n.CopyPictureWithMask

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MBS Xojo blog