I downloaded the library for Komplete and it came in .rar compression. I thought- Windows 8 would unzip any folders- .zip or .rar, but it asks me what program to use. Any suggestions would be greatly appreciated. Thank you.

You can use the free program 7zip, it will uncompress .rar files, as well as other formats.
 
www.7-zip.org
 

WinRAR is a shareware file archiver and data compression utility developed by Eugene Roshal. That program has the .rar extensions
 
http://download.cnet.com/RAR-File-Open-Knife-Free-Opener/3000-2250_4-10971016.html
 
The above link is a program to assist you in opening those files

Thank you for your reply. How about Win Zip? http://www.winzip.com/prodpagewz.html
 
I thought I had it installed but I don't see it any more. I remember- it was counting days installed and never open at the end, or I had to wait for it to open. Is the 7 Zip works same annoying way?
 
So Windows 8 would unzip .zip files but not .rar?
 
Thank you.

Also- for 7 Zip- it says, that 32 bit version is .exe, but 64 bit version is .msi? Does it makes sense? I also see links on the right to newer versions- does it look valid to you- it takes me to some forum.

This is what makes .rar files annoying. Now you need a separate third party program outside of the operating system to open those files.
 
Here is a free extractor that will work on ZIP, 7z, RAR, ISO, JAR, LHA, CAB or TAR
 
http://download.cnet.com/free-rar-extractor/3028-2250_4-75754791.html?c=SEM&s=fivemill&pid=dlcom_sem&aid=free%20rar%20extractor-b&dlc=n&part=fivemill

vladasyn
Also- for 7 Zip- it says, that 32 bit version is .exe, but 64 bit version is .msi? Does it makes sense? I also see links on the right to newer versions- does it look valid to you- it takes me to some forum.

They are the different types of installers. Use the 64bit msi installer for 64bit Windows. The links are good, they take you to the SourceForge site and automatically start the download from there.

+1 for 7-zip.
 
http://www.7-zip.org/

Thank you for your replies. Scook, do you mean the main link to 7-Zip 9.20 version or on the site, to 7-Zip 9.30? It says it developmental version and link goes to the forum.

If you're lost on what version to install, go here http://www.7-zip.org/download.html and give the second link (.msi 32-bit for x86 systems) a try. I personally use 7-zip over the others for the sake that it doesn't nag me to purchase anything.
 
Also, it's super helpful if you need to break large files up into smaller volumes (I often have to do this if I'm trying to move an .iso onto my external hard drive since it's formatted as Fat32 for Windows and Mac compatibility but won't accept files over 4 GBs in size).
 
If you want to get really geeky with it, you can also use it to encrypt and password protect important digital documents (taxes, etc.). I'm sure there's some genius who knows how to break that code though. 
 
Anyhow, I like 7-zip :)