I use global option: AddDefaultCharset windows-1251 in my httpd.conf. And I have some directories with included HEADER files in directory index. Directory listing sever output always give ISO charset. In Apache 2.0.59 directory index charset is windows-1251 and all working fine.
The charset needs to be set via IndexOptions since 2.0.61 (see http://httpd.apache.org/docs/2.0/en/mod/mod_autoindex.html#indexoptions).
*** Bug 43490 has been marked as a duplicate of this bug. ***