Hello, Did you manage to find a solution?

Not really. I managed to obtain the url of the file with the following trick. I can try to find something similar to write the file back, but I'm afraid it might be unstable or unpredictable. import ObjectiveC // Declare a global var to produce a unique address as the assoc object handle private var AssociatedObjectHandle: UInt8 = 0 extension FileWrapper {     var fileURL: URL? {         get {             return objc_getAssociatedObject(self, &AssociatedObjectHandle) as? URL         }         set {             objc_setAssociatedObject(self, &AssociatedObjectHandle, newValue, objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN_NONATOMIC)         }     }     @objc convenience init(trick url: URL, options: ReadingOptions) throws {         try self.init(trick: url, options: options)         self.fileURL = url     } } struct Trick {     static func execute() {         let aClass: AnyClass = FileWrapper.self         let originalMethod = class_getInstanceMethod(aClass, #selector(FileWrapper.init(url:options:)))         let swizzledMethod = class_getInstanceMethod(aClass, #selector(FileWrapper.init(trick:options:)))         guard let originalMethod = originalMethod, let swizzledMethod = swizzledMethod else {             return         }         method_exchangeImplementations(originalMethod, swizzledMethod)     } }