If you don't know how to set the .bxl file association, check the FAQ. Changing the filename extension of a file is not a good idea. When you change a file's extension, you change the way programs on your computer read the file. The problem is, changing the file extension does not change the file format.
Social work licensure and certification, including specialty certification, must be maintained by completing continuing education courses. Requirements for the number of hours and the types of courses that can be taken vary for each state.
If you do not want to give up your paid job, you can undertake the social work degree on a part time basis. The previous qualifications necessary to become a social worker were the Certificate in Social Service (CSS), the Certificate of Qualification in Social Work (CQSW) and Diploma in Social Work (DipSW).