The file has a problem because one of the materials is named:
AZ}X][‘XC’'FGC_Material_____;;;;;;;;BNNN JJJJJJJJJJJMaterial____________63Material63333333_+5_ … JXCR … RE FDMJNMKLJM.0N , 2 … N 99999_9.Color_007550yyyyyyyyyjhu78juhhhhhhhhyjjki89kjoooiiiiiiiiiiiiiiiiiii_,_____________,
That causes a problem with 2021 format files. Do you have a recent version of the file that is a 2020 file? If you do, you could rename the material, and then it would be ok in 2021.