Win7-ult-sp1-x64-u-24535-esd.iso Patched

Stands for Electronic Software Download . Unlike a standard .iso which usually contains a WIM (Windows Imaging Format) file that is uncompressed or loosely compressed, an ESD file uses a high-compression algorithm (LZMS).

No official Windows 7 build ends in 24535 . This is often used in custom/modified ISOs to appear "newer" or to bypass telemetry/updates. win7-ult-sp1-x64-u-24535-esd.iso

The filename refers to a specific disk image of Windows 7 Ultimate with Service Pack 1 . Stands for Electronic Software Download