'window-related' is a modern English compound formed from the noun 'window' and the adjective 'related'. 'window' itself is an English word ultimately from Old Norse 'vindauga' (wind + eye), and 'related' is the past participle adjective from the verb 'relate'.

'window' comes from Old Norse 'vindauga' (literally 'wind-eye'), passed into Old and Middle English as forms like 'windoge'/'windowe' and became modern 'window'. 'Related' derives from Latin via Old French and Middle English from the verb 'relate' (past participle 'related'), so the compound 'window-related' arose by productive compounding in modern English.

Individually, 'window' originally carried the literal sense 'wind-eye' and 'related' meant 'connected' or 'brought into relation'; combined as a compound in modern usage the phrase simply means 'connected with windows' (either physical or software).