Philip Taylor wrote: > D:\>tex \input "a\space \space a.tex" Or (even simpler, tho' perhaps marginally less transparent) -- D:\>tex \input "a \space a.tex" This is TeX, Version 3.14159265 (TeX Live 2014/W32TeX) (preloaded format=tex) (./a a.tex ) No pages of output. Transcript written on "a a.log".