The Desktop Fractal Design System--with floppy disk and letter about computer virus

Softcover, 38pp booklet + 5.25” floppy drive in mint condition. Illustrated throughout and with line by line command breakdowns. Housed in printed card folder with original warranty, registration card with serial number, and a certified Western Union mailgram from William Frucht, head of the Library of Science Small Computer Book Club, explaining that copies of the program with red stickers had disks infected with a “Friday the 13th” virus and to contact him if he received such a copy. This copy has a yellow sticker (“now VGA and EGA compatible!”) so probably does not have the virus, though it appears the disk was never used and remains like new.