Man pages matching name icewm-winoptions in section 5:

icewm-winoptions.5.en	debian 10 / icewm-common
icewm-winoptions.5.en	debian 11 / icewm-common
icewm-winoptions.5.en	debian 12 / icewm-common
icewm-winoptions.5.en	debian 13 / icewm-common