The FeliX32 Analysis software appears to use ANG format as proprietary which means this is the only application to open it. However, based on a Google Search query, the ANG format belongs to AIMSUN NG, but they don't have any application available to download to open it. I believe you will have to get in touch with them to provide the necessary software.
Additionally, open the original file in FeliX32 and then re-export it to the proper format.
Contact info: http://www.aimsun.com/wp/?page_id=54