if(not uses.contain("ps = Photoshop"))
		sys.add_use('ps = Photoshop')
		blk_init.println('if (Type.GetTypeFromProgID("Photoshop.Application", null, false) == null) {').inc()
		.println('MessageBox.Show("Adobe Photoshop is not installed", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);')
		.println('Environment.Exit(1);')
		.dec().println('}')
		// adds assembly
		if(this.props("VersionCS").value == '5.0')
			sys.add_assembly('Interop.Photoshop', 'Interop.Photoshop.dll', 'assembly\\AdobeCS5.0\\')
		elseif(this.props("VersionCS").value == '5.5')
			sys.add_assembly('Interop.Photoshop', 'Interop.Photoshop.dll', 'assembly\\AdobeCS5.5\\')
		elseif(this.props("VersionCS").value == '6.0')
			sys.add_assembly('Interop.Photoshop', 'Interop.Photoshop.dll', 'assembly\\AdobeCS6.0\\')
		end
	end