completion-ignored-extensions's value is (".svn/" "CVS/" ".o" "~"
".bin" ".lbin" ".so" ".a" ".ln" ".blg" ".bbl" ".elc" ".lof" ".glo"
".idx" ".lot" ".dvi" ".fmt" ".tfm" ".pdf" ".class" ".fas" ".lib"
".mem" ".x86f" ".sparcf" ".fasl" ".ufsl" ".fsl" ".dxl" ".pfsl" ".dfsl"
".lo" ".la" ".gmo" ".mo" ".toc" ".aux" ".cp" ".fn" ".ky" ".pg" ".tp"
".vr" ".cps" ".fns" ".kys" ".pgs" ".tps" ".vrs" ".pyc" ".pyo")