Now that the BSA is opened in your program of choice, DDSopt users will need to click the menu on the top bar and select.
Make sure " Always use this selected program to open this kind of file" is selected and click
BSAopt or DDSopt should then appear highlighted in the "Open with" dialog box.
Click then find and select "BSAopt.exe" or "DDSopt.exe".
Next choose "Select a program from a list of installed programs" and click.
This only needs to be done once and then BSAs can be opened by simply double-clicking them.
(Optional but recommended for general use) Set BSA archives to be opened with BSAopt or DDSopt by default.
Instructions for extracting BSAs using either program are as follows: Instructions for installation and initial setup of BSAopt are available here, and instructions for setup of DDSopt are found in DDSopt Configuration. If you don't mind having another application installed, BSAopt is easier to use and doesn't require potential configuration changes every time it's used. The difference between the programs is that because DDSopt is primarily used to alter the files it is extracting, it requires an extra step to use purely as an extraction tool. Both BSAopt and DDSopt are built off of the same architecture, but DDSopt has a different primary purpose: optimizing textures.