Fallout Mod Manager BSA Browser if you have F03 or FNV installed that works the best..
Else you can try these if you do not have Fallout installed
BSAOpt - http://www.skyrimnexus.com/downloads/file.php?id=247
Skyrim BSA Browser - http://www.skyrimnexus.com/downloads/file.php?id=1395
do not use OBMM does not extract bsa correctly..