Yes. It's an open source computer program.
No, if you download it on the safe site (like rarlabs.com).
Yes it's safe. There are other options such as IZArc if your computer has issues with 7zip.
Get 7zip.
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Nope! 7zip is a good archiving and compressing program. Virus on the 7zip depends on file you download or the version of 7zip you dl. You could run a system scan to check if 7zip have viruses.
To download music using 7Zip you need to open and access the file, select the music you wish to download and begin download when prompted.
Winrar or 7zip
By using an archiver, like B1 Free Archiver or 7zip.
winrar, wizip, 7zip, Izark...
That depends on what program was used to create the archive in the first place, but in most cases Winrar is entirely sufficient. The only problem is has is with 7zip archives in which case you also need to download 7zip.
Winrar, 7zip those types of programs
use 7zip to extract and view what is in the target file