I downloaded software last night that was extremely big. It was more than 560MB. The file was broken up into 3 separate files, all with a RAR extension. After the download, I ended up with 3 RAR files.
The only way to unzip the files and to put them all together was to use 7zip, which is a better alternative to PKZip because 7zip is free and open-source. It also handles tar, and its own 7z formatting. Extracting on any of the 3 RAR files will extract all parts into one file.
The only problem was the resulting file had a NRG extension. I don’t have a Nero CD or DVD burning software. The only way around to it was to convert NRG to ISO which is better anyways, because ISO is standard as opposed to NRG, which is proprietary.
I ended up finding this great utility online called NGR2ISO. The best part of this exercise is, NGR2ISO is free, open-source and it simply works.