if(not uses.contain("ac = Acrobat"))
		sys.add_use('ac = Acrobat')
		blk_init.println('if (Type.GetTypeFromProgID("AcroExch.App", null, false) == null) {').inc()
		.println('MessageBox.Show("Adobe Acrobat 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.Acrobat', 'Interop.Acrobat.dll', 'assembly\\AdobeCS5.0\\', 'True')
		elseif(this.props("VersionCS").value == '5.5')
			sys.add_assembly('Interop.Acrobat', 'Interop.Acrobat.dll', 'assembly\\AdobeCS5.5\\', 'True')
		elseif(this.props("VersionCS").value == '6.0')
			sys.add_assembly('Interop.Acrobat', 'Interop.Acrobat.dll', 'assembly\\AdobeCS6.0\\', 'True')
		end
	end