I fixed this by editing Inkscape\etc\fonts\conf.d\51-local.conf by adding <dir>d:\fonts\</dir> between <fontconfig> and </fontconfig>
where d:\fonts\ is my font directory
Changing <dir>WINDOWSFONTDIR</dir> to <dir>d:\fonts\</dir> in Inkscape\etc\fonts\fonts.conf makes Inkscape to ignore the system fonts (if you want to see only the custom fonts list)
I fixed this by editing Inkscape\ etc\fonts\ conf.d\ 51-local. conf by adding <dir>d: \fonts\ </dir> between <fontconfig> and </fontconfig>
where d:\fonts\ is my font directory
Changing <dir>WINDOWSFON TDIR</dir> to <dir>d: \fonts\ </dir> in Inkscape\ etc\fonts\ fonts.conf makes Inkscape to ignore the system fonts (if you want to see only the custom fonts list)