Thanks for your reply mmccarn. My problem was that during the battle taking place over past 24 hours with MS applications (#$!!&*!), I had somehow corrupted the ASX files... There is also a fair amount of confusion with the syntax of MIME extensions, i.e. whether the extension itself should be preceded by a dot or not (AddType video/x-ms-asf asf asx versus AddType video/x-ms-asf .asf .asx). After fixing my *.asx files I ended up adding the following using the template method outlined in my first post:
[root@test1 httpd.conf]# cat 75AddType01video.asx
#add mime support for asx files
AddType video/x-ms-asf .asx .asf
AddType application/x-mplayer2 .asx
AddType audio/x-scpls .pls
AddType audio/mpeg .mp3
AddType audio/x-mpegurl .m3u
AddType audio/x-ms-wma .wma
AddType audio/x-ms-wax .wax
AddType video/x-ms-wmv .wmv
AddType video/x-ms-wvx .wvx
AddType video/x-ms-wmx .wmx
AddType application/ogg .ogm
AddType application/ogg .ogg
A bit of an overkill, but will get me ready to stream other formats later on.
All is well now.