404. That’s an error.

The requested URL /custom?q=Bufexplorer.vim&safe=active&client=pub-3005259998294962&cof=FORID:13%3BAH:left%3BS:http://www.vim.org%3BCX:Vim%2520Search%3BL:http://www.vim.org/images/vim_header.gif%3BLH:45%3BLC:%230000ff%3BVLC:%23663399%3BDIV:%23336699%3B&cx=partner-pub-3005259998294962:bvyni59kjr1&adkw=AELymgW9WJul6gEJaMNDa3Sh1Gq8vtLBDmZsFXRRpjLsrZhKCkiRxZTofYoUuR0OGlJ33g8RDe_3p9no-ypEEjOBm_W4HZje_d8tgDLO2sQIEFtF3lhK_uZG4Kop1rN3cwVDGx8bzL7U_HWz2trdvVTQkL0u--hhnMDIjgyasKuARMw7ZQt7Kj4&hl=en&channel=7394275211&boostcse=0&ie=UTF-8&oe=ISO-8859-1&prmd=ivns&ei=rsm0WPW0EYidgAbz6amQDw&start=10&sa=N was not found on this server. That’s all we know.