Winrar used to be the best, but over the years it hasn't really kept up with the latest compression methods, the best out there (in my opinion) is 7zip, i haven't found a compressed file it won't open yet (except certain encrypted filed which i will deny seeing if asked
).
Primary Desktop:
i7 7700,k NV1070 8GB, 16GB 3200mhz memory, 1x 2TB Hybrid, Win10.
Secondary Desktop:
i5 4760k, NV960 2GB, 16GB 2333mhz memory, 1x 2TB Hybrid, Win10.
Laptop:
i3, Intel 4000 series graphics, 6GB memory, 1x 500gb HDD, Win8.1.