—represents a "Custom ISO," a modified version of the Windows installer often found on peer-to-peer networks.
Technical Analysis and Security Evaluation of Windows 10 x64 21H1 Pro 3in1 OEM ESD (pt-BR) Distribution Windows 10 X64 21H1 Pro 3in1 OEM ESD pt-BR JUNH...
Indicates the files are highly compressed to reduce the download size (typically around 4.20GB for this release). —represents a "Custom ISO," a modified version of
Since 21H1 is unsupported, immediately after installing: —represents a "Custom ISO