fontview is the Windows Font viewer; it doesn't like dquotes: fontview "osaka-sans serif.ttf" will result in an error ("invalid font file") message while fontview osaka-san serif.ttf (mind the unquoted space) will not. I'd like to setup a file assciation mapping that strips any - automatically added (e.g. through command line expansion) - dquotes from the file name before submitting it to fontview. So far: a) set .ttf=fontview.exe => dquotes are not stripped (obviously) => error (works however with unquoted names like e.g. arial.ttf) b) set .ttf=`%@strip[^^",%1]` => error (*) c) function stripdq=`%strip[^^",%1]` (*) set .ttf=`stripdq[%1]` (*) Strange enough, typing the first letter ("0") of the font name expands the file name; hence tcc is able to deduct that the font file is a TTF file to apply the .ttf= setting to. Any hints?