WIC index suppoort fails

Question

When I tried to convert bmp file in to AIT format having black & white option, and then use WICExplorer to open the same file . It opened succesfully. But when I tried to convert same bmp file in to "8bpp indexed format" it converted the file , but when try to open using WICexplorer, it fails to open having display same error "WINCODEC_ERR_COMPONENTNOTFOUND". I am sured now my registry entry working fine, because same codec used for black & white option and work fine . So if anybody faced the same issue earlier , please help me in it.