asc files are just plain old text files. open them up in notepad...you'll see the extension doesn't matter, the contents are plain text, the same way .txt files are.
--help us help you! If you post a question, make sure you include a CREATE TABLE... statement and INSERT INTO... statement into that table to give the volunteers here representative data. with your description of the problem, we can provide a tested, verifiable solution to your question! asking the question the right way gets you a tested answer the fastest way possible!