You may be able to right-click the file and select Extract All directly in File Explorer. Using 7-Zip (Recommended):
The .7z extension at the end of "isfull" indicates that this is a compressed archive created using 7-Zip technology. isfull.7z
"isfull" is a custom name chosen by the person who created the archive. It is not a standard system file. Is isfull.7z Safe? You may be able to right-click the file
Popular alternatives like WinRAR or WinZip can also open these archives. open-source tool from 7-zip.org.
Since 7z is a specialized format, you usually need third-party software to open it, though some newer systems have built-in support.
Download and install the free, open-source tool from 7-zip.org.