this is common knowledge, i have just forgotten it — to widen the primary column in an apache directory listing :

Alias /alias /location_of_alias
<Directory "/location_of_alias">
    IndexOptions NameWidth=*
</Directory>

just replace /alias with the alias to be used. also replace /location_of_alias with the actual directory/location that is going to be referenced.

and obviously, this is to be added at the end of the httpd.conf