Index: subversion/mod_dav_svn/liveprops.c
===================================================================
--- subversion/mod_dav_svn/liveprops.c	(revision 15345)
+++ subversion/mod_dav_svn/liveprops.c	(working copy)
@@ -19,6 +19,7 @@
 
 
 #include <httpd.h>
+#include <http_core.h>
 #include <util_xml.h>
 #include <apr_tables.h>
 #include <apr_md5.h>
@@ -368,7 +369,7 @@
                      && resource->info->r->content_type)
               mime_type = resource->info->r->content_type;
             else
-              mime_type = "text/plain"; /* default for file */
+              mime_type = ap_default_type (resource->info->r);
 
             if ((serr = svn_mime_type_validate (mime_type, p)))
               {
Index: subversion/mod_dav_svn/repos.c
===================================================================
--- subversion/mod_dav_svn/repos.c	(revision 15345)
+++ subversion/mod_dav_svn/repos.c	(working copy)
@@ -2102,7 +2102,7 @@
                && r->content_type)
         mimetype = r->content_type;
       else
-        mimetype = "text/plain";
+        mimetype = ap_default_type (r);
 
       serr = svn_mime_type_validate(mimetype, resource->pool);
       if (serr)