All of these applications are free for personal use.
Zip Utiiliies
IZArc
http://www.izarc.org/ ->
(To combine split files you download from my MediaFire account, first you must download all pieces, make sure they're in the same directory, then open the .zip file with IZArch; it will merge and extract for you.)
Video Players
These players will play nearly anything, including .ts files (DVR), ISOs (DVD), and traditional DVD files (the ones you see in folders if you open up a DVD on a computer).
VideoLAN
http://www.videolan.org/ ->
MediaPlayer Classic
http://mpc-hc.sourceforge.net/ ->