Really should of posted this first...
WinRar
for downloading packs, zip.files, rar etc, this is what you need to open them.
Codec MPC
For playing movies, music videos, mp3, you'll need this. Because it plays ALL file types from - Avi. Mp1. MP2. MP4. to mkv, DVDs, Divx, VCDs, FLV (flash) and Blu-Ray.
HJ-SPlit
with files that are 2 big to upload, you can use HJ-Split to break down and combine the files. (Most big files such as movies, albums, software are HJ-Splits on this site) Much faster then winRar combining.