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WindoWriter

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What WindoWriter is

WindoWriter is free, MIT-licensed software for creating UEFI-bootable Windows USB installers from Windows 10, Windows 11, or older ISO files. It provides a SwiftUI GUI on macOS and command-line operation on macOS, Linux, and Windows; Linux and Windows currently use the CLI. After copying files, it checks sizes and SHA-256 hashes for boot-critical files, with an option to verify every file. It handles ESD images, pre-split SWM media, and oversized WIM files by splitting them for FAT32. The CLI can download Intel RST/VMD drivers while writing or add custom INF driver folders. Safety checks block the boot disk, require explicit permission for internal disks, check prerequisites, and ask for erase confirmation. The project says installers support UEFI and Secure Boot. Linux writing needs root access, Windows needs an elevated prompt, and macOS 13 or newer is required.

Who it suits

WindoWriter suits users creating Windows installation USB drives for UEFI machines, including terminal users and automation scripts. It also fits users who need verification, driver provisioning, or handling of ESD, SWM, and large WIM images.

What it does well

  • Supports UEFI and Secure Boot
  • Verifies boot-critical files with SHA-256
  • Handles ESD, SWM, and oversized WIM images
  • Can add Intel RST/VMD or custom drivers
  • Includes safeguards before disk erasure

What to know first

  • GUI is currently macOS-only
  • Legacy BIOS support is not current
  • Linux writing requires root access
  • macOS requires version 13 or newer

Verdict

WindoWriter offers cross-platform command-line creation of Windows UEFI installers, with a macOS GUI and several image and driver options. Its safeguards and verification checks are useful, but platform requirements and the lack of current legacy-BIOS support matter when choosing it.

Facts from WindoWriter's own pages

Additional dependencies
Large images on macOS require wimlib, while Linux requires parted, dosfstools, and wimtools for large images; Windows ESD images also require wimlib. · github.com, 11 Oct 2026
Boot limits
Legacy BIOS boot and Windows 11 requirement-bypass patching are listed as roadmap items, not current features. · github.com, 11 Oct 2026
Boot support
The project says its USB installers boot on UEFI machines and support Secure Boot; legacy BIOS support is listed on the roadmap. · github.com, 11 Oct 2026
Custom drivers
Users can add custom INF-based driver folders with the --driver option. · github.com, 11 Oct 2026
Dependencies
Large images require wimlib on macOS and Linux; Windows uses DISM for WIM splitting, while ESD-based Windows ISOs also need wimlib. · github.com, 11 Oct 2026
Disk safeguards
It refuses to write to the boot disk, refuses internal disks unless explicitly allowed, and requires confirmation before erasing a drive. · github.com, 11 Oct 2026
Driver provisioning
The --intel-rst option downloads Intel RST/VMD drivers at write time and adds them to the USB; custom INF driver folders are also supported. · github.com, 11 Oct 2026
Image formats
It supports ESD images, pre-split SWM media, and splitting oversized WIM files into FAT32-sized parts. · github.com, 11 Oct 2026
Intel storage drivers
The --intel-rst option downloads Intel RST/VMD drivers at write time and places them on the USB for Windows Setup. · github.com, 11 Oct 2026
Intended use
The project describes its CLI as suitable for scripts and automation as well as terminal users. · github.com, 11 Oct 2026
Interface
It provides a macOS GUI and a command line interface across macOS, Linux, and Windows. · github.com, 11 Oct 2026
Interfaces
It provides a SwiftUI GUI on macOS and a command-line interface on macOS, Linux, and Windows. · github.com, 11 Oct 2026
License
The repository identifies its license as MIT. · github.com, 11 Oct 2026
Platform limits
The GUI is currently macOS-only; Linux and Windows use the CLI, and native GUIs for those platforms are on the roadmap. · github.com, 11 Oct 2026
Purpose
WindoWriter turns Windows 10/11 or older ISO files into UEFI bootable USB installers. · github.com, 11 Oct 2026
Requirements
Writing on Linux requires root access and Windows requires an elevated prompt; macOS requires version 13 or newer. · github.com, 11 Oct 2026
Safety checks
It checks prerequisites before formatting, refuses to write to the boot disk, and requires confirmation before erasing a drive. · github.com, 11 Oct 2026
Secure Boot
The project says the resulting USB installer boots with Secure Boot because it uses Microsoft's boot files and writes no third-party bootloader. · github.com, 11 Oct 2026
Support
The project welcomes issues and pull requests on GitHub. · github.com, 11 Oct 2026
Write verification
After copying, it checks file sizes and SHA-256 hashes for boot-critical files, with an option to verify every file. · github.com, 11 Oct 2026

Where WindoWriter stands on Freedom251

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