windows 10 max thumb preview gone

I uninstalled max 2016 and lost mx file thumbnail preview in windows 10 explorer. ( still have max 2017 installed)
Tried reinstalling max but no luck. I tried regsvr32 “C:\Program Files\Autodesk\3ds Max 2017\MaxThumbnailShellExt.dll” but also no luck.

Can soemone with working thumbnail preview check HKEY_CLASSES_ROOT\.max what you got there? I have onlu DefaultIcon REG_SZ max_auto_file

Maybe there’s something more needed there.

having the same issue when uninstalling or installing older versions after newer versions, its been this way for a long time, years its like this idk why autodesk doesn’t sort it out

I have found the solution finally !!!
Run cmd as admin and run this regsvr32 “C:\Program Files\Autodesk\3ds Max 2017\MaxThumbnailShellExt.dll”
and then add to registry the file Dropbox

This will only work for windows 10, my issue is getting max 2015 to be the main version of max to open and on windows 7

These two articles have helped me out a few times when dealing with file associations in Win 7. Although I don’t think they will fix the thumbnail problem.

https://social.technet.microsoft.com/Forums/windows/en-US/3ddd2350-6323-4f3c-9377-dba0acb53a33/unable-to-associate-file-types?forum=w7itproui

ok this little baby did it
http://windowsxp.mvps.org/openwithadd.htm