How to open a .7z archive?

[bandit4910]

I keep getting the 'Can not open file [Filename] as archive' from 7zip. How do I fix this?

[Ted]

'Why can\'t 7-Zip open some ZIP archives?

In 99% of these cases it means that the archive contains incorrect headers. Other ZIP programs can open some archives with incorrect headers, since these programs just ignore errors.

If you have such archive, please don\'t call the 7-Zip developers about it. Instead try to find the program that was used to create the archive and inform the developers of that program that their software is not ZIP-compatible.

There are also some ZIP archives that were encoded with methods unsupported by 7-Zip, for example, WAVPack (WinZip).'

Source: http://www.7-zip.org/faq.html

TL;DR: Probably a corrupt archive.

[bandit4910]

'Why can\'t 7-Zip open some ZIP archives?

In 99% of these cases it means that the archive contains incorrect headers. Other ZIP programs can open some archives with incorrect headers, since these programs just ignore errors.

If you have such archive, please don\'t call the 7-Zip developers about it. Instead try to find the program that was used to create the archive and inform the developers of that program that their software is not ZIP-compatible.

There are also some ZIP archives that were encoded with methods unsupported by 7-Zip, for example, WAVPack (WinZip).'

Source: http://www.7-zip.org/faq.html

TL;DR: Probably a corrupt archive.

Turns out if I use the wait screen of sourceforge it corrupts the archives. I used a direct link given and the archive was fine.