You probably ended up on this site because you have trouble with a downloaded file.
Well then... let's see if I can help you. Here is a little F.A.Q.:

.7z or .zip? What's this?
The file you downloaded has the ending .zip or .7z and you can't open it?
I compress the files I upload to make them smaller which results in a faster download for you.
.zip files can be unzipped with nearly every compressing programm out there.
Even Windows (XP and higher) has native support for zip files and can unzip them.
If you still can't unzip them, try 7-Zip, which you can get at http://www.7-zip.org.
7-zip is pretty small, supports a lot of different operating systems as well as a different
compression formats and on top of that it is free to use !
And... it of course supports it's very own .7z format, which most of my files are compressed in.
7-zip offers a better compression than .zip or .rar and can be unzipped by many other tools as well which is the reason why I use it.
For example WinZip and WinRar both can unzip 7z files.

I unzipped the file but the video is not playing!

You are missing either the required codecs or a media player which supports the codecs.
My files are encoded in H.264 (.mp4), Windows Media (.wmv), DivX (.avi) or Xvid (.avi).
Windows Media should be supported by Windows without any codec.
In case you still need one, try one from here: https://www.microsoft.com/en-us/download/details.aspx?id=507
Codecs for DivX can be found at http://www.divx.com and try http://www.xvid.org for Xvid.
And try http://www.videolan.org/developers/x264.html for the H.264 Codec.
If this still doesn't help you can try a different Media Player.
I recommend VLC which you can download for free at http://www.videolan.org/vlc.

This should probably answer most of the questions you might have. If you still have problems, try contacting me directly here.