I-ReactOS 0.4.12 isifikile , ukukhishwa kwakamuva okuletha i-Windows Snapping, izingqikithi ezintsha, kanye nezibuyekezo ze-kernel kulolu hlelo lokusebenza oluvulekile. Ihambisana ne-binary ne-Microsoft Windows, okusho ukuthi izama ukulingisa uhlelo lwenkampani i-Redmond ukuze isofthiwe yayo ifakwe ngaphandle kwezinkinga (kahle… ngenkinga yesikhashana, njengaseWine). Kodwa ngaphandle kokungabaza, kuyindlela ethokozisayo esikhundleni se-MS Windows, ikakhulukazi yokufunda ukuthi isebenza kanjani.
Uma unesifiso sokulanda nokuzama le nguqulo entsha yesistimu yokusebenza ye-ReactOS, 0.4.12, ungayithola kuwebhusayithi esemthethweni yephrojekthi . Lapho uzothola futhi lonke uhlobo lolwazi mayelana nephrojekthi kanye ne-changelog nazo zonke izici ezintsha abathuthukisi abazifezile ngemuva kwezinyanga eziyisithupha zomsebenzi kusukela kunguqulo 0.4.11. Phakathi kwezinto eziphawuleka kakhulu yi-Window Snapping, isici esivumela abasebenzisi ukuthi bashintshe usayizi wamawindi.
Uzothola nezinqamuleli zekhibhodi, ukuqina okwandisiwe, ukulungiswa kwamaphutha , ukwenziwa kwefonti okuthuthukisiwe kwezinkinobho kuzinhlelo zokusebenza ezahlukahlukene, izingqikithi ezimbili ezintsha zokushintsha ukubukeka (okubizwa ngokuthi i-Mizu ne-Lunar, njengoba ubona esithombeni esiyinhloko), kanye nokusekelwa kwamakhadi enethiwekhi e-Intel e1000 NIC. I-kernel ye-ReactOS, engeyona i-Linux njengoba abanye bekholelwa ngephutha, nayo ithuthukisiwe.
Phakathi kwezinguquko ze-kernel kukhona ukuthuthukiswa kwabashayeli besistimu yamafayela, ukuphathwa kwamandla, ukuthuthukiswa kwabashayeli be-CDFS, ukwesekwa kwe-PXE boot okuthuthukisiwe, kanye nokunye ukuthuthukiswa kokuphepha. Ukusekelwa kwe-Wine 4.0 , enye iphrojekthi esetshenziswa yi-ReactOS, nakho kungeziwe. Lokhu kuthuthukiswa kwakamuva kuletha ukwesekwa kwezinye izinhlelo zokusebenza zomdabu ze-Microsoft Windows ezazibhekene nezinkinga zokuhambisana ngaphambilini.