Windows – New Windows 8 context menu: official name and documentation

Try the following instead:

Windows Registry Editor Version 5.00

[HKEY_CLASSES_ROOT\.lua]
@="LuaScript"

[HKEY_CLASSES_ROOT\.lua\ShellNew]
"NullFile"=""

[HKEY_CLASSES_ROOT\LuaScript]
@="Lua Script File"

The key to finding these was to essentially follow what Windows has for text files, or what it calls "Text Document." A few reboots later, I got the needed "new Lua script file" function.

You need to add some more registry keys:

Windows Registry Editor Version 5.00

[HKEY_CLASSES_ROOT\.md]
@="markdown"

[HKEY_CLASSES_ROOT\.md\ShellNew]
"NullFile"=""

[HKEY_CLASSES_ROOT\markdown]
@="Blank Markdown file"

@=markdown points to the new registry key, whose default value ends up being the description and name of the new file.

You may also need to add the following to set the icon (but I think it is optional):

[HKEY_CLASSES_ROOT\markdown]
"DefaultIcon"="%SystemRoot%\system32\imageres.dll,-102"

Finally, from ShellNewHandler you may have to:

1. uncheck .md
2. apply
3. check .md
4. apply