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The osx x86_64 swt jar as available in the Eclipse 4.6 (Neon) release for OSX. It is suitable for use with jface and other dependencies available from maven central in the org.eclipse.scout.sdk.deps group. The sources is copied from swt-4.6-cocoa-macosx-x86_64.zip from http://download.eclipse.org/eclipse/downloads/drops4/R-4.6-201606061100/ and javadoc is generated from sources.
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/*******************************************************************************
 * Copyright (c) 2003, 2013 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.swt.browser;

import org.eclipse.swt.SWT;
import org.eclipse.swt.internal.*;
import org.eclipse.swt.internal.mozilla.*;
import org.eclipse.swt.widgets.*;

class FilePicker {
	XPCOMObject supports;
	XPCOMObject filePicker;

	int refCount = 0;
	short mode;
	long /*int*/ parentHandle;
	String[] files, masks;
	String defaultFilename, directory, title;

	static final String SEPARATOR = System.getProperty ("file.separator"); //$NON-NLS-1$

FilePicker () {
	createCOMInterfaces ();
}

int AddRef () {
	refCount++;
	return refCount;
}

void createCOMInterfaces () {
	/* Create each of the interfaces that this object implements */
	supports = new XPCOMObject (new int[] {2, 0, 0}) {
		@Override
		public long /*int*/ method0 (long /*int*/[] args) {return QueryInterface (args[0], args[1]);}
		@Override
		public long /*int*/ method1 (long /*int*/[] args) {return AddRef ();}
		@Override
		public long /*int*/ method2 (long /*int*/[] args) {return Release ();}
	};

	filePicker = new XPCOMObject (new int[] {2, 0, 0, 3, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}) {
		@Override
		public long /*int*/ method0 (long /*int*/[] args) {return QueryInterface (args[0], args[1]);}
		@Override
		public long /*int*/ method1 (long /*int*/[] args) {return AddRef ();}
		@Override
		public long /*int*/ method2 (long /*int*/[] args) {return Release ();}
		@Override
		public long /*int*/ method3 (long /*int*/[] args) {return Init (args[0], args[1], (short)args[2]);}
		@Override
		public long /*int*/ method4 (long /*int*/[] args) {return AppendFilters ((int)/*64*/args[0]);}
		@Override
		public long /*int*/ method5 (long /*int*/[] args) {return AppendFilter (args[0], args[1]);}
		@Override
		public long /*int*/ method6 (long /*int*/[] args) {return GetDefaultString (args[0]);}
		@Override
		public long /*int*/ method7 (long /*int*/[] args) {return SetDefaultString (args[0]);}
		@Override
		public long /*int*/ method8 (long /*int*/[] args) {return GetDefaultExtension (args[0]);}
		@Override
		public long /*int*/ method9 (long /*int*/[] args) {return SetDefaultExtension (args[0]);}
		@Override
		public long /*int*/ method10 (long /*int*/[] args) {return GetFilterIndex (args[0]);}
		@Override
		public long /*int*/ method11 (long /*int*/[] args) {return SetFilterIndex ((int)/*64*/args[0]);}
		@Override
		public long /*int*/ method12 (long /*int*/[] args) {return GetDisplayDirectory (args[0]);}
		@Override
		public long /*int*/ method13 (long /*int*/[] args) {return SetDisplayDirectory (args[0]);}
		@Override
		public long /*int*/ method14 (long /*int*/[] args) {return GetFile (args[0]);}
		@Override
		public long /*int*/ method15 (long /*int*/[] args) {return GetFileURL (args[0]);}
		@Override
		public long /*int*/ method16 (long /*int*/[] args) {return GetFiles (args[0]);}
		@Override
		public long /*int*/ method17 (long /*int*/[] args) {return Show (args[0]);}
	};
}

void disposeCOMInterfaces () {
	if (supports != null) {
		supports.dispose ();
		supports = null;
	}
	if (filePicker != null) {
		filePicker.dispose ();
		filePicker = null;
	}
}

long /*int*/ getAddress () {
	return filePicker.getAddress ();
}

int QueryInterface (long /*int*/ riid, long /*int*/ ppvObject) {
	if (riid == 0 || ppvObject == 0) return XPCOM.NS_ERROR_NO_INTERFACE;
	nsID guid = new nsID ();
	XPCOM.memmove (guid, riid, nsID.sizeof);

	if (guid.Equals (XPCOM.NS_ISUPPORTS_IID)) {
		XPCOM.memmove (ppvObject, new long /*int*/[] {supports.getAddress ()}, C.PTR_SIZEOF);
		AddRef ();
		return XPCOM.NS_OK;
	}
	if (guid.Equals (IIDStore.GetIID (nsIFilePicker.class))) {
		XPCOM.memmove(ppvObject, new long /*int*/[] {filePicker.getAddress ()}, C.PTR_SIZEOF);
		AddRef ();
		return XPCOM.NS_OK;
	}

	XPCOM.memmove (ppvObject, new long /*int*/[] {0}, C.PTR_SIZEOF);
	return XPCOM.NS_ERROR_NO_INTERFACE;
}

int Release () {
	refCount--;
	if (refCount == 0) disposeCOMInterfaces ();
	return refCount;
}

Browser getBrowser (long /*int*/ aDOMWindow) {
	if (aDOMWindow == 0) return null;
	return Mozilla.getBrowser (aDOMWindow);
}

/*
 * As of Mozilla 1.8 some of nsIFilePicker's string arguments changed type.  This method
 * answers a java string based on the type of string that is appropriate for the Mozilla
 * version being used.
 */
String parseAString (long /*int*/ string) {
	return null;
}

/* nsIFilePicker */

int Init (long /*int*/ parent, long /*int*/ title, short mode) {
	parentHandle = parent;
	this.mode = mode;
	this.title = parseAString (title);
	return XPCOM.NS_OK;
}

int Show (long /*int*/ _retval) {
	if (mode == nsIFilePicker.modeGetFolder) {
		/* picking a directory */
		int result = showDirectoryPicker ();
		XPCOM.memmove (_retval, new short[] {(short)result}, 2); /* PRInt16 */
		return XPCOM.NS_OK;
	}

	/* picking a file */
	int style = mode == nsIFilePicker.modeSave ? SWT.SAVE : SWT.OPEN;
	if (mode == nsIFilePicker.modeOpenMultiple) style |= SWT.MULTI;
	Browser browser = getBrowser (parentHandle);
	Shell parent = null;
	if (browser != null) {
		parent = browser.getShell ();
	} else {
		parent = new Shell ();
	}
	FileDialog dialog = new FileDialog (parent, style);
	if (title != null) dialog.setText (title);
	if (directory != null) dialog.setFilterPath (directory);
	if (masks != null) dialog.setFilterExtensions (masks);
	if (defaultFilename != null) dialog.setFileName (defaultFilename);
	String filename = dialog.open ();
	files = dialog.getFileNames ();
	directory = dialog.getFilterPath ();
	title = defaultFilename = null;
	masks = null;
	int result = filename == null ? nsIFilePicker.returnCancel : nsIFilePicker.returnOK;
	XPCOM.memmove (_retval, new short[] {(short)result}, 2); /* PRInt16 */
	return XPCOM.NS_OK;
}

int showDirectoryPicker () {
	Browser browser = getBrowser (parentHandle);
	Shell parent = null;
	if (browser != null) {
		parent = browser.getShell ();
	} else {
		parent = new Shell ();
	}
	DirectoryDialog dialog = new DirectoryDialog (parent, SWT.NONE);
	if (title != null) dialog.setText (title);
	if (directory != null) dialog.setFilterPath (directory);
	directory = dialog.open ();
	title = defaultFilename = null;
	files = masks = null;
	return directory == null ? nsIFilePicker.returnCancel : nsIFilePicker.returnOK;
}

int GetFiles (long /*int*/ aFiles) {
	return XPCOM.NS_ERROR_NOT_IMPLEMENTED;
}

int GetFileURL (long /*int*/ aFileURL) {
	return XPCOM.NS_ERROR_NOT_IMPLEMENTED;
}

int GetFile (long /*int*/ aFile) {
	String filename = "";	//$NON-NLS-1$
	if (directory != null) filename += directory + SEPARATOR;
	if (files != null && files.length > 0) filename += files[0];
	nsEmbedString path = new nsEmbedString (filename);
	long /*int*/[] file = new long /*int*/[1];
	int rc = XPCOM.NS_NewLocalFile (path.getAddress (), 1, file);
	path.dispose ();
	if (rc != XPCOM.NS_OK) Mozilla.error (rc);
	if (file[0] == 0) Mozilla.error (XPCOM.NS_ERROR_NULL_POINTER);
	XPCOM.memmove (aFile, file, C.PTR_SIZEOF);
	return XPCOM.NS_OK;
}

int SetDisplayDirectory (long /*int*/ aDisplayDirectory) {
	if (aDisplayDirectory == 0) return XPCOM.NS_OK;
	nsILocalFile file = new nsILocalFile (aDisplayDirectory);
	nsEmbedString pathname = new nsEmbedString ();
	int rc = file.GetPath (pathname.getAddress());
	if (rc != XPCOM.NS_OK) Mozilla.error (rc);
	directory = pathname.toString ();
	pathname.dispose ();
	return XPCOM.NS_OK;
}

int GetDisplayDirectory (long /*int*/ aDisplayDirectory) {
	String directoryName = directory != null ? directory : "";	//$NON-NLS-1$
	nsEmbedString path = new nsEmbedString (directoryName);
	long /*int*/[] file = new long /*int*/[1];
	int rc = XPCOM.NS_NewLocalFile (path.getAddress (), 1, file);
	path.dispose ();
	if (rc != XPCOM.NS_OK) Mozilla.error (rc);
	if (file[0] == 0) Mozilla.error (XPCOM.NS_ERROR_NULL_POINTER);
	XPCOM.memmove (aDisplayDirectory, file, C.PTR_SIZEOF);
	return XPCOM.NS_OK;
}

int SetFilterIndex (int aFilterIndex) {
	return XPCOM.NS_ERROR_NOT_IMPLEMENTED;
}

int GetFilterIndex (long /*int*/ aFilterIndex) {
	return XPCOM.NS_ERROR_NOT_IMPLEMENTED;
}

int SetDefaultExtension (long /*int*/ aDefaultExtension) {
	/* note that the type of argument 1 changed as of Mozilla 1.8 */
	return XPCOM.NS_ERROR_NOT_IMPLEMENTED;
}

int GetDefaultExtension (long /*int*/ aDefaultExtension) {
	/* note that the type of argument 1 changed as of Mozilla 1.8 */
	return XPCOM.NS_ERROR_NOT_IMPLEMENTED;
}

int SetDefaultString (long /*int*/ aDefaultString) {
	defaultFilename = parseAString (aDefaultString);
	return XPCOM.NS_OK;
}

int GetDefaultString (long /*int*/ aDefaultString) {
	/* note that the type of argument 1 changed as of Mozilla 1.8 */
	return XPCOM.NS_ERROR_NOT_IMPLEMENTED;
}

int AppendFilter (long /*int*/ title, long /*int*/ filter) {
	/* note that the type of arguments 1 and 2 changed as of Mozilla 1.8 */
	return XPCOM.NS_ERROR_NOT_IMPLEMENTED;
}

int AppendFilters (int filterMask) {
	String[] addFilters = null;
	switch (filterMask) {
		case nsIFilePicker.filterAll:
		case nsIFilePicker.filterApps:
			masks = null;			/* this is equivalent to no filter */
			break;
		case nsIFilePicker.filterHTML:
			addFilters = new String[] {"*.htm;*.html"}; //$NON-NLS-1$
			break;
		case nsIFilePicker.filterImages:
			addFilters = new String[] {"*.gif;*.jpeg;*.jpg;*.png"};	//$NON-NLS-1$
			break;
		case nsIFilePicker.filterText:
			addFilters = new String[] {"*.txt"};	//$NON-NLS-1$
			break;
		case nsIFilePicker.filterXML:
			addFilters = new String[] {"*.xml"};	//$NON-NLS-1$
			break;
		case nsIFilePicker.filterXUL:
			addFilters = new String[] {"*.xul"};	//$NON-NLS-1$
			break;
	}
	if (masks == null) {
		masks = addFilters;
	} else {
		if (addFilters != null) {
			String[] newFilters = new String[masks.length + addFilters.length];
			System.arraycopy (masks, 0, newFilters, 0, masks.length);
			System.arraycopy (addFilters, 0, newFilters, masks.length, addFilters.length);
			masks = newFilters;
		}
	}
	return XPCOM.NS_OK;
}
}