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I've tried downloading multiple roms all with the .7z extension on separate computers ubuntu and windows and for most files whether it be PsX, Ps2, MAME, or SNES I can't get the archives to extract with 7-zip. I've tried redownloading the same file to see if the file corrupted and letting my computer sit and checking my connection but I can't seem to find the source of the problem. How do I open the archive to get the files to extract?
If 7-zip is reporting back the archive is corrupt the chances are it is your downloads that are failing
The best way round this is to use a download manager, something like freedownloadmanager should do the trick
Are the downloads all separate or part of a larger single archive? Could it be this is a split archive download and you have to download all parts?
The usual way of extracting the contents in these cases is to download all parts to a single location/folder and then unpack the primary folder using 7-Zip. All the other parts will, or should be, automatically unpacked along with it.