The only legitimate size reduction method is Microsoft’s own install.esd format (used in Media Creation Tool), which still yields a final ISO of .
Technical and Security Investigation into “Windows 10 ISO Highly Compressed” Distributions Date: [Current Date] Prepared For: IT Security Team / Systems Administration Report ID: IR-2024-W10-COMP-001 1. Executive Summary Finding: Files marketed as “Highly Compressed Windows 10 ISO” (e.g., Win10.Pro.21H2.x64.Highly.Compressed.7z , Windows_10_Lite_1GB.rar ) are almost universally malicious or non-functional . windows 10 iso highly compressed
| Sample | Claimed Size | Actual Extracted Size | Outcome | | :--- | :--- | :--- | :--- | | A | 610 MB | 6.2 GB (fake padding) | Contained coin miner in setup.exe | | B | 480 MB | 480 MB (no extraction) | Archive password-protected; password obtained from Telegram – yielded a data-stealer | | C | 920 MB | 1.1 GB (unbootable) | Missing install.wim ; contained only a WinPE shell + ransomware dropper | The only legitimate size reduction method is Microsoft’s