Some drivers in Windows 7 and 8 require WDF 1.11, which is not available in Windows XP. The latest verison of WDF that supports Windows XP is 1.9. By applying some changes, the system modules will be usable in Windows XP, therefore improving the success of backporting drivers.

Goal

There should be two new files installed in the target system: wdfld8.sys and wdf01_w8.sys. Both files will be backported to Windows XP/2003.

Requirements

Instructions

Download and extract

  1. Download update KB3125574 from Windows Update Catalog. Move the downloaded file to a clean folder. Windows update catalog
    • 32-bit: Choose Update for Windows 7 (KB3125574).
    • 64-bit: Choose Update for Windows 7 for x64-based Systems (KB3125574).
  2. Open command prompt and navigate to the directory containing the downloaded update file. Command prompt, run cd
  3. Run the following commands:
    • 32-bit: 
        expand windows6.1-kb3125574-v4-x86_ba1ff5537312561795cc04db0b02fbb0a74b2cbd.msu -F:Windows6.1-KB3125574-v4-x86.cab .
  expand Windows6.1-KB3125574-v4-x86.cab -F:wdf01000.sys .
  expand Windows6.1-KB3125574-v4-x86.cab -F:wdfldr.sys .

      Run x86 commands

    • 64-bit: 
        expand windows6.1-kb3125574-v4-x64_2dafb1d203c8964239af3048b5dd4b1264cd93b9.msu -F:Windows6.1-KB3125574-v4-x64.cab .
  expand Windows6.1-KB3125574-v4-x64.cab -F:wdf01000.sys .
  expand Windows6.1-KB3125574-v4-x64.cab -F:wdfldr.sys .

      Run x64 commands

  4. A new folder should appear, containing the files wdf01000.sys and wdfldr.sys. Move these files to a more convenient place for editing. Extract files

Rename

WDF 1.9 already installs its own wdf01000.sys and wdfldr.sys. WDF 1.11 must not override the 1.9 files, or risk system instability. To work around this issue, the WDF 1.11 files will be renamed.

As a side effect, all backported drivers that depend on any of the two WDF 1.11 files will also need to have the import tables modified to reflect these new names.

  1. Rename wdf01000.sys to wdf01_w8.sys.
  2. Rename wdfldr.sys to wdfld8.sys. Rename files

Modify with CFF Explorer

wdf01_w8.sys

  1. In Import Directory:
    • Change the entry for ntoskrnl.exe to ntoskrn8.sys.
    • Change the entry for wdfldr.sys to wdfld8.sys. Replace wdf01_w8.sys import directory
  2. In Rebuilder, recalculate the checksum.
  3. Save the file.

wdfld8.sys

  1. In Hex Editor, search for the Hex 640030003000300.
    • This is to search for the Unicode string \Registry\Machine\System\CurrentControlSet\Services\Wdf%02d000, but the Unicode search option is bugged.
  2. Replace the Hex values with 64 00 5F 00 77 00 38 00.
    • This replaces the string with \Registry\Machine\System\CurrentControlSet\Services\Wdf%02d_w8. Replace wdfld8.sys Unicode string
  3. Scroll to the top of the file and set the cursor to the first entry. Search for the Hex:
    • 32-bit: F6781BF6
    • 64-bit: 85FF782A
  4. Replace the Hex values with:
    • 32-bit: F6 EB 1B F6 Replace x86 wdfld8.sys hex values
    • 64-bit: 85 FF EB 2A Replace x64 wdfld8.sys hex values
  5. In Rebuilder, recalculate the checksum.
  6. Save the file.

Install

The files will need to be installed manually before any backported driver can be installed.

  1. Transfer wdf01_w8.sys and wdfld8.sys to somewhere accessible to the target system, such as a flash drive or a network-accessible folder.
  2. In your target system, move the files into the folder at C:\Windows\system32\drivers. Install wdf01_w8.sys and wdfld8.sys