Convert .ESD to .WIM

Guide on how to convert a Windows Electronic Software Delivery (.ESD) file to a standard Windows Imaging Format (.WIM) file.

Why Convert?

• .ESD: Highly compressed, encrypted, read-only. Used by Microsoft for downloads. Cannot be mounted or modified.
• .WIM: Standard compression, writeable. Can be mounted (dism /mount-wim) to add drivers, updates, or remove apps.

Prerequisites

• DISM (Built into Windows)
• Administrator Privileges
• The .esd file (usually found in sources folder of Windows installer).

Step-by-Step Guide

1. Identify Index Number

An ESD file often contains multiple Windows editions (Home, Pro, Edu). You must choose one to export.

1. Open generic Command Prompt as Administrator.

2. Run:

   dism /Get-WimInfo /WimFile:C:\Path\To\install.esd

3. Note the Index Number of the edition you want (e.g., Index 6 = Windows 11 Pro).

2. Export to WIM

Use the /Export-Image command to convert.

dism /Export-Image /SourceImageFile:C:\Path\To\install.esd /SourceIndex:6 /DestinationImageFile:C:\Path\To\install.wim /Compress:max /CheckIntegrity

Parameters Explored:

• /SourceImageFile: Path to ESD.
• /SourceIndex: The number you found in Step 1.
• /DestinationImageFile: Where to save the WIM.
• /Compress:max: Uses LZX compression (Standard for WIM).
• /CheckIntegrity: Verifies file after creation.

Troubleshooting

"Access Denied"

• Ensure specific file is not Read-Only.
• Run CMD as Administrator.

"Error 87"

• Check spelling of parameters.
• Ensure Destination file does not already exist (DISM appends to existing WIMs vs creating new files sometimes, but export usually needs new file or appends).

Recovering Space

The resulting .wim file will be significantly larger than the .esd file (often 30% larger) because WIM compression is less aggressive than ESD (LZMS) compression.