What program can I use to combine a file I downloaded in parts?

[Druid]

I've got like 5 compressed parts, and I need to know what I can use to join them all together.

 

[Trotter]

If they are .rar files, use Winrar. WinRAR - Free software downloads and reviews - CNET Download.com

It is nagware. It keeps working and prompts you to buy.

 

[Druid]

Yeah, i figured that out. Thanks