Run wow with -console suffixed, like this:
"C:\Games\WoW\wow.exe -console"
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Open the console during login screen using '`' key.
Then write in the following value(s) and hit enter:
ExportInterfaceFiles art
ExportInterfaceFiles code
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Atleast this is what I imagine is intended.
I might be wrong on the console key part, as the default is '`'.