parker@debian:~/Downloads$ cat forza.7z.001 >> f.7z
parker@debian:~/Downloads$ cat forza.7z.002 >> f.7z
parker@debian:~/Downloads$ p7zip -d f.7z

7-Zip (A) [64] 9.20  Copyright (c) 1999-2010 Igor Pavlov  2010-11-18
p7zip Version 9.20 (locale=en_US.UTF-8,Utf16=on,HugeFiles=on,2 CPUs)

Processing archive: f.7z

Extracting  Forza Motorsport.7z
Extracting  IGNORE ME.txt

Everything is Ok

Files: 2
Size:       2959370986
Compressed: 2959530102
parker@debian:~/Downloads$