BIM360 temp folder

 https://forums.autodesk.com/t5/bim-360-team-forum/desktop-connector-uninstall-error/td-p/9307930

That directory is a temporary "working directory" used for Desktop Connector.  With Desktop Connector not running it is safe to delete the C:\ProgramData\Autodesk\CDX\WD\ directory.

Excel string text together

 =TEXTJOIN(" ",TRUE,B2:B12)

Windows get product key

From Command Prompt 

CMD

wmic path softwarelicensingservice get OA3xOriginalProductKey