This function guesses and returns the MIME type of the file, based on the extension in the file name. It uses a set of default mappings and any mappings that are in the [ns/server/servername/mimetypes] section of the nsd.ini file. The default mappings are:
.ai=application/postscript .aif=audio/aiff .aiff=audio/aiff .ani=application/x-navi-animation .au=audio/basic .avi=video/x-msvideo .bin=application/x-macbinary .bmp=image/bmp .dp=application/commonground .exe=application/octet-stream .gif=image/gif .gz=application/x-compressed .hqx=application/mac-binhex40 .htm=text/html .html=text/html .jfif=image/jpeg .jpe=image/jpeg .jpg=image/jpeg .jpeg=image/jpeg .map=application/x-navimap .mov=video/quicktime .mpe=video/mpeg .mpeg=video/mpeg .mpg=video/mpeg .nvd=application/x-navidoc .nvm=application/x-navimap .pbm=image/x-portable-bitmap .pdf=application/pdf .pgm=image/x-portable-graymap .pic=image/pict .pict=image/pict .pnm=image/x-portable-anymap .ps=application/postscript .qt=video/quicktime .ras=image/x-cmu-raster .rgb=image/x-rgb .rtf=application/rtf .sit=application/x-stuffit .snd=audio/basic .stl=application/x-navistyle .tar=appliation/x-tar .text=text/plain .tgz=application/x-compressed .tif=image/tiff .tiff=image/tiff .txt=text/plain .xbm=image/x-xbitmap .xpm=image/x-xpixmap .wav=audio/x-wav .z=application/x-compressed .zip=application/x-compressed
Ns_ServerMimeType(), Ns_MimeIcon() (C API)