There is no purge routine for these two files. The content in these files represent the log of Elliott orders created from the Web site through Web services. If you would like to purge them, you may copy the corresponding two files in the Elliott root directory and just override it. For example,
Copy m:\elliott7\wsord*.btr m:\elliott7\data
Assuming m:\elliott7 is your Elliott root directory. M:\elliott7\data is your data folder.