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=AELymgV7OlAGTFS8Pp_u-MBGfcXRBC7H1g1ah1b_4jHvpBxR6--WstHDtgCz4ct2v5tjQ26lSZM4774VIy9Ec7q5ffcAUT7IS9cm8ha-GiUZ_D8ecztPlFWL5yvmFMu2ckHQlU5N6Uh1nT2D3WYoZ9LysoPZubdPPvmmbYbDNuR6k7MAaanKCQo&hl=en&channel=7394275211&boostcse=0&ie=UTF-8&oe=ISO-8859-1&prmd=ivns&ei=tkBVVrfrL8T0-AGDlbKwAg&start=40&sa=N was not found on this server. That’s all we know.