(Internet slang, dated) Windows (an operating system)

window / (regional, dialect, Etchū region) a deep gap in a mountain ridge (so called for the way the wind blows through, like a window)

window

aboriginal (original; indigenous)

open

open / start; beginning

a doss-house, cheap lodging, a flophouse, especially in a skid row area or slum / a hangout or meeting place for criminal gangs

The hiragana syllable ど𛅒 (dwo). Its equivalent in katakana is ド𛅦 (dwo).

(onomatopoeia, informal) flowing thickly

(Kansai) what kind