import aspose.cad as cad;

loadOption = cad.LoadOptions()
loadOption.specified_encoding = cad.CodePages.JAPANESE
loadOption.specified_mif_encoding = cad.MifCodePages.JAPANESE
loadOption.recover_malformed_cif_mif = False

cadImage = cad.Image.load("file.dwg", loadOption)

//do export or something else with cadImage