Here are some links to follow: https://www.chess.com/forum/view/general/icofy-chess-database---where
What operating system are you using? Linux is my favorite, but if you're using Windows, it has built-in tools to unzip a file. Right-click and select unzip/extract. Once the files our on you PC as PGN files, you should have no problem opening them with Scid or Scid vs. PC.
Cheers.
Hi
I have downloaded scid vs pc and searched all over the web for some databases to download into scid vs pc for studying openings and chess games. I have downloaded some twic pgn files, but when I try to open them in scid vs pc there are just errors because they are in zip format. I also have this problem with a 2,2 million game database but that file are in exe. What should I do?