Design files with lengthy file paths might cause an internal error in the Windows version of the Quartus Prime Pro Edition software

Because of the hierarchical manner in which the Quartus Prime Pro Edition software organizes the design database files, an internal error might occur in the Windows version of the Quartus Prime Pro Edition software when the file path to a design file is too long.

Windows has a 260-character limit on the combined length of a file name and its file path. To reduce the length of a file path to a design file, avoid storing your Quartus Prime project in a directory that is far removed from the drive location.