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This is a free program that you may install and use on your device. There is no need to sign up and no need to pay for a subscription.
Your regular Windows unzipping facility probably doesn't unlock RAR files, but 7 Zip does allow you unzip RAR files. You are able to unzip TAR files, ISO files and ZIP files.
Yes, 7 Zip does have bloatware that you will have to opt out of when you install it. However, it doesn't have as much bloatware as WinZip.
7 Zip is not as stable, nor is it as complex, but it works as a very simple file unzipper, and it is very compact. If all you are looking to do is zip and unzip files, then there is no need for a paid unzipper and no need for a complex or large program.
Run the unzipping program in administrator mode. Right-click on the 7 Zip file manager icon and run it as an administrator. If you do this, then you are able to use the software to set your file associations.
Some programs try to have you install bloatware by frequently sending you annoying update requires. There is none of that with this program because you may turn off updates and you may update manually whenever you wish.
This program works on Windows 10, and over the years it has been updated as new operating systems come out. Since Windows has never had an unzipping program that opens RAR files, it is likely that this tool will continue to exist in the future and will continue to be updated.
Over the years there have been updates that have allowed different version of RAR files to be packed and unpacked. At the moment, there are very few varieties of RAR file that cannot be opened.
The same is true for ZIP files as for RAR files where the program has been updated over the years to allow the unzipping of newer version of ZIP archive files. Since this program is free and doesn't require registration, you may as well try the tool to see if it can unlock/unzip your files.
If you are not able to unzip/unpack your files, but you are able to see a list of files when you look into the file, then there is a small chance that you will be able to recover your files. If you get the error message, "Can not open file 'a.7z' as archive" then there is also a chance you may be able to recover some of your files. You will need to try the Z-Zip recovery procedure.