Koofiyada Cas ayaa daabacday siideynta xasilloon ee xirmada Cygwin 3.3.0, oo ay ku jirto maktabad DLL ah oo loogu talagalay ku dayashada aasaaska Linux API ee Windows, taasoo kuu oggolaaneysa inaad ururiso barnaamijyada loo sameeyay Linux oo leh isbeddello yar. Xirmadan waxa kale oo ka mid ah adeegyada Unix caadiga ah, codsiyada server-ka, isku-dubaridayaasha, maktabadaha iyo faylalka madaxa ee si toos ah la isugu keenay si loogu fuliyo Windows.