Open Regedit:
- Click Start
- Type regedit.exe
Find the associated key:
- Browse to HKEY_CLASSES_ROOT\3dsmax\Shell\Open\Command
- Double click on the (Default) entry
- Edit the path so it points to the 3dsmax.exe you’d like to use by default: “C:\Program Files\Autodesk\3ds Max 2015\\3dsmax.exe” “%1”
- Use quotes and keep the “%1”