HJ-Split is supported on several different operating systems. You can pick the one that you need from their home page at http://www.freebyte.com/hjsplit/
HJ-Split 2.4 is the most current version of the program for windows and Linux. Also make sure to download HJJoin if you only want to use the program to join .001 files back together.
After you download HJ-Split, use WinRAR or 7Zip to extract the executable file. HJSplit does not actually have to be installed for the function of the programs to be used. After you extract, you should just have an hjsplit.exe file.
Open the hjsplit.exe file to bring up the control panel.
You can select what process of HJsplit you would like to use. You can either use HJ-Split to join .001 files or use it to split a file into smaller parts.
Joining 001 files with HJ-Split
A – Select Join
Once you select the Join function of HJSplit, it will open another window. It will ask you to find the input file, or the 001 file that you would like to join.
A – Click on the input file button to bring up an explorer window. Find the .001 file. You will only need to find the first .001 file because if the .002, .003, etc are in the same directory, HJ-Split will find the rest of the .001 files. Once you define the input file, click “Start.”
This will bring up a progress window.
Once HJ-Split is complete with the process, it will bring up a notification window letting you know that is complete.
The joined file should be in the same directory of the original .001 file unless you specified another output directory.