shizuoka an-s knee mill=kflop/kanalog running nema 34 dc brushed servos
cincinnati sabre 750=kflop/kanalog building now with ac brushless servos
Is would appear that Windows has lost it's file associations.
When you see that panel, click Browse and find C:\ProgramFiles\Dolphin\Cadcam\PartMaster\Programs or C:\ProgramFiles(x86)\Dolphin\Cadcam\PartMaster\Pro grams
Here you find the .exe files, choose Dcad.exe for drawings, Dcam.exe for Mill/Turn, Dwes.exe for Wire EDM files, also, check the box "Always use this program...."
ATB
Andre