# Default MIME Types in Mosaic 2.0pre4

Mosaic 2.0pre4 maps the following MIME types to viewers:

    application/x-wais-source    -> handled natively
    application/x-hdf            -> handled natively (*)
    application/x-netcdf         -> handled natively (*)
    application/hdf              -> handled natively (*)
    application/netcdf           -> handled natively (*)
    audio/*                      -> showaudio %s
    image/xwd                    -> xwud -in %s
    image/x-xwd                  -> xwud -in %s
    image/x-xwindowdump          -> xwud -in %s
    image/*                      -> xv %s
    video/mpeg                   -> mpeg_play %s
    application/postscript       -> ghostview %s
    application/x-dvi            -> xdvi %d
    message/rfc822               -> xterm -e metamail %s

    (*) These only apply if Mosaic is built with native
        HDF/netCDF support.

Handling of `application/x-wais-source` cannot be modified.

Handling of the HDF/netCDF types cannot be turned off if Mosaic is built with native HDF/netCDF support, but can be overridden by a system or user mailcap file.

Handling of the remaining types can be turned off by setting the X resource `useDefaultTypeMap` to `false`, or they can be overridden by a system or user mailcap file.

Unrecognized MIME types will, by default, be passed to the "magic viewer" `mosaic-internal-dump`, which causes them to be dumped to disk automatically (you will be given a dialog box to specify a local filename). You can override this behavior by specifying a viewer for type `*/*` (or `*`) in a system or user mailcap file.

Any MIME type can also be mapped (in a system or user mailcap file) to the "magic viewer" `mosaic-internal-dump` to cause it to dump to disk automatically.

For more information on mailcap files and MIME types, see here.