ID:275020 Can't open file <name>. Files created in MAX+PLUS II (DOS version) and earlier are not supported.

CAUSE: You directed the Quartus Prime software to open the specified file, but the Quartus Prime software cannot open it because it is in a MAX+PLUS II format that is not supported by the Quartus Prime software.

ACTION: Open the file in the MAX+PLUS II software version 8.2 or later, save the file, and re-open it in the Quartus Prime software.