'How to access root from subdomain

Let's say I've got my ErrorDocuments in my root folder (files).

files
|
|----- .htaccess
|
|----- index.html
|
|----- 404.html
|
|----- 403.html
|
|----- ...
|
|
|----- abc ----- index.html
        |
        |------- .htaccess

My files/.htaccess

ErrorDocument 401 /401.html
ErrorDocument 403 /403.html
ErrorDocument 404 /404.html
ErrorDocument 500 /500.html

My provider does automatically link domain.com/abc to abc.domain.com. But if I get a error on my subdomain my 404.html doesn't show up because the webroot for abc.domain.com is domain.com/abc and not domain.com.

How can I configure my webspace so I can access my root without hardcoding my domain.



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