CtrlP extension for fuzzy-searching available file types.
CtrlP should be installed
Plugin provides CtrlPFileType command which will
pop up a list of available file types.
Types are gathered from syntax files names.
That is plugin will look through all runtime pathes (&rtp)
looking for files matching /syntax/*.vim pattern.
To add own file types in your .vimrc you can do
let g:ctrlp_filetypes = {}
let g:ctrlp_filetypes['filetype'] = 'optional description'
" e.g
let g:ctrlp_filetypes['cpp'] = 'C++ source file'
let g:ctrlp_filetypes['eruby'] = 'Embedded Ruby'
let g:ctrlp_filetypes['conf'] = 'Configuration file'