Extract the ASH files, they are archives. You'll need to use this tool to do so: http://wiibrew.org/wiki/ASH_Extractor
Inside, you should eventually be able to find some WADs. There may be some U8 archives within the ASH archive (these can have differing file extensions, often .app though). They can be extracted with something like UltimateU8 or U8Mii from this: http://showmiiwads.g...Tools%200.3.rar
(There's also a TPL tool in there if you need one, although the best is gxtexconv from libogc I believe)
Inside, you should eventually be able to find some WADs. There may be some U8 archives within the ASH archive (these can have differing file extensions, often .app though). They can be extracted with something like UltimateU8 or U8Mii from this: http://showmiiwads.g...Tools%200.3.rar
(There's also a TPL tool in there if you need one, although the best is gxtexconv from libogc I believe)