Subashni Ravichandran
Forum Moderator

Jurgen Rautert 
I checked with the development team and this error usually appears when the program is launched without the command /UseSubscription=true.

When a program is set as the default to open a particular file type, an entry is added to the Windows registry.  
That entry points to the executable (spaceclaim.exe for example) but does not include additional commands.

Look for the registry key ComputerHKEY_CLASSES_ROOTstp_auto_fileshellopencommand

Modify the value to the following:

"C:Program FilesANSYS Incv221scdmspaceclaim.exe" "%1" "USERUNNINGSPACECLAIM=true" /UseLicenseMode=true


Let me know if this works