ID:23772 OK to convert the setting files for this revision to the new format? Converting the settings files does not affect the design files or other source files, and may take a few minutes depending on the number of assignments.

CAUSE: You attempted to open the revision, created with the Quartus Prime software version 3.0 or earlier, but the file format is not compatible for use with the current version of the Quartus Prime software. The Quartus Prime software is asking if you want to convert the settings files for use with the Quartus Prime software version 4.0 or later.

ACTION: Click OK to convert the setting files. Converting the settings files does not affect the original design files or other source files. Click Cancel to leave the revision in the current file format.