How to make explorer show a code preview for .ahk files in the preview pane:

1. Create a new .txt document

2. Copy & Paste this into it:

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Windows Registry Editor Version 5.00

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[HKEY_CLASSES_ROOT\.ahk\ShellEx]

[HKEY_CLASSES_ROOT\.ahk\ShellEx\{8895b1c6-b41f-4c1c-a562-0d564250836f}]

@="{1531d583-8375-4d3f-b5fb-d23bbd169f22}"

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3. Change the file extension from .txt to .reg

4. Run the .reg file and click Yes.