This utility allows you to browse bsa archives and extract individual files from them. Click open to open an archive and see the files contained within it. You can sort the files by a number of criteria using the combo box on the bottom right. (Real time sorting is too slow, as the base bsa archives contain many thousands of files. Each time you want to resort the file list, click 'sort')
You can view information about a file by hovering the mouse over it.
To extract a single file, double click on it, or drag/drop it from the BSA browser into windows explorer or another file manager that supports drag/drop. To extract multiple files, shift or control click files, and then click extract. To extract the whole archive, click 'extract all'. You can also click close to close the archive ready to open a new one.