In /usr/share/application, what contains your file mimeinfo.cache ?
I have this :
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[MIME Cache]
application/asx=gnome-mplayer.desktop;
application/excel=gnumeric.desktop;
application/msexcel=gnumeric.desktop;
application/msword=defaultwordprocessor.desktop;
application/musepack=gnome-mplayer.desktop;
application/mxf=totem.desktop;
application/notecase-enc=notecase.desktop;
application/notecase-plain=notecase.desktop;
application/ogg=gnome-mplayer.desktop;totem.desktop;
application/pdf=evince.desktop;
application/pet=petget.desktop;
application/postscript=ghostview.desktop;evince.desktop;
application/ram=totem.desktop;
application/sdp=totem.desktop;
application/smil=gnome-mplayer.desktop;totem.desktop;
application/smil+xml=totem.desktop;
application/tab-separated-values=gnumeric.desktop;
application/vnd.apple.mpegurl=totem.desktop;
application/vnd.lotus-1-2-3=gnumeric.desktop;
application/vnd.ms-asf=ffconvert.desktop;
application/vnd.ms-excel=gnumeric.desktop;
application/vnd.ms-wpl=totem.desktop;
application/vnd.openxmlformats-officedocument.spreadsheetml.sheet=gnumeric.desktop;
application/vnd.rn-realaudio=gnome-mplayer.desktop;
application/vnd.rn-realmedia=gnome-mplayer.desktop;ffconvert.desktop;totem.desktop;
application/vnd.sun.xml.calc=gnumeric.desktop;
application/vnd.sun.xml.calc.template=gnumeric.desktop;
application/x-123=gnumeric.desktop;
application/x-annodex=ffconvert.desktop;
application/x-ape=gnome-mplayer.desktop;
application/x-applix-spreadsheet=gnumeric.desktop;
application/x-bittorrent=transmission-gtk.desktop;
application/x-bzpdf=evince.desktop;
application/x-bzpostscript=evince.desktop;
application/x-cb7=evince.desktop;
application/x-cbr=evince.desktop;
application/x-cbt=evince.desktop;
application/x-cbz=evince.desktop;
application/x-cmakecache=CMake.desktop;
application/x-dbase=gnumeric.desktop;
application/x-dbf=gnumeric.desktop;
application/x-dos_ms_excel=gnumeric.desktop;
application/x-drm-v2=gnome-mplayer.desktop;
application/x-dvi=ffconvert.desktop;
application/x-excel=gnumeric.desktop;
application/x-extension-m4a=totem.desktop;
application/x-extension-mp4=totem.desktop;
application/x-flac=gnome-mplayer.desktop;totem.desktop;
application/x-flash-video=totem.desktop;
application/x-glade=glade-3.desktop;
application/x-gnumeric=gnumeric.desktop;
application/x-gzpdf=evince.desktop;
application/x-gzpostscript=evince.desktop;
application/x-httpd-php3=geany.desktop;
application/x-httpd-php4=geany.desktop;
application/x-httpd-php5=geany.desktop;
application/x-id3=gnome-mplayer.desktop;
application/x-matroska=totem.desktop;
application/x-mplayer2=gnome-mplayer.desktop;ffconvert.desktop;
application/x-mps=gnumeric.desktop;
application/x-ms-excel=gnumeric.desktop;
application/x-ms-wmv=gnome-mplayer.desktop;
application/x-msexcel=gnumeric.desktop;
application/x-musepack=gnome-mplayer.desktop;
application/x-netshow-channel=totem.desktop;
application/x-nsv-vp3-mp3=gnome-mplayer.desktop;
application/x-ogg=gnome-mplayer.desktop;totem.desktop;
application/x-oleo=gnumeric.desktop;
application/x-php=geany.desktop;
application/x-planperfect=gnumeric.desktop;
application/x-quattropro=gnumeric.desktop;
application/x-quicktime-media-link=totem.desktop;
application/x-quicktimeplayer=gnome-mplayer.desktop;ffconvert.desktop;totem.desktop;
application/x-sc=gnumeric.desktop;
application/x-shockwave-flash=ffconvert.desktop;
application/x-shorten=totem.desktop;
application/x-smil=totem.desktop;
application/x-sylk=gnumeric.desktop;
application/x-vorbis+ogg=gnome-mplayer.desktop;
application/x-xbase=gnumeric.desktop;
application/x-xls=gnumeric.desktop;
application/x-xzpdf=evince.desktop;
application/xls=gnumeric.desktop;
application/xml=geany.desktop;
application/xspf+xml=totem.desktop;
audio/3gpp=totem.desktop;
audio/AMR=totem.desktop;
audio/AMR-WB=totem.desktop;
audio/ac3=totem.desktop;
audio/ape=gnome-mplayer.desktop;
audio/basic=gnome-mplayer.desktop;totem.desktop;
audio/flac=gnome-mplayer.desktop;totem.desktop;
audio/midi=gnome-mplayer.desktop;totem.desktop;
audio/mp=gnome-mplayer.desktop;
audio/mp2=totem.desktop;
audio/mp3=gnome-mplayer.desktop;
audio/mp4=gnome-mplayer.desktop;totem.desktop;
audio/mpc=gnome-mplayer.desktop;
audio/mpeg=gnome-mplayer.desktop;totem.desktop;
audio/mpeg2=gnome-mplayer.desktop;
audio/mpeg3=gnome-mplayer.desktop;
audio/mpegurl=totem.desktop;
audio/musepack=gnome-mplayer.desktop;
audio/ogg=gnome-mplayer.desktop;totem.desktop;
audio/prs.sid=totem.desktop;
audio/vnd.rn-realaudio=totem.desktop;
audio/vorbis=gnome-mplayer.desktop;
audio/wav=gnome-mplayer.desktop;
audio/webm=gnome-mplayer.desktop;
audio/x-aiff=totem.desktop;
audio/x-ape=gnome-mplayer.desktop;totem.desktop;
audio/x-basic=gnome-mplayer.desktop;
audio/x-flac=gnome-mplayer.desktop;totem.desktop;
audio/x-gsm=totem.desktop;
audio/x-it=gnome-mplayer.desktop;totem.desktop;
audio/x-m4a=gnome-mplayer.desktop;totem.desktop;
audio/x-matroska=totem.desktop;
audio/x-mod=gnome-mplayer.desktop;totem.desktop;
audio/x-mp=gnome-mplayer.desktop;
audio/x-mp3=gnome-mplayer.desktop;totem.desktop;
audio/x-mpc=gnome-mplayer.desktop;
audio/x-mpeg=gnome-mplayer.desktop;totem.desktop;
audio/x-mpeg-3=gnome-mplayer.desktop;
audio/x-mpeg2=gnome-mplayer.desktop;
audio/x-mpeg3=gnome-mplayer.desktop;
audio/x-mpegurl=gnome-mplayer.desktop;totem.desktop;
audio/x-ms-asf=totem.desktop;
audio/x-ms-asx=totem.desktop;
audio/x-ms-wax=gnome-mplayer.desktop;totem.desktop;
audio/x-ms-wma=gnome-mplayer.desktop;totem.desktop;
audio/x-ms-wmv=gnome-mplayer.desktop;
audio/x-musepack=gnome-mplayer.desktop;totem.desktop;
audio/x-ogg=gnome-mplayer.desktop;
audio/x-pn-aiff=totem.desktop;
audio/x-pn-au=totem.desktop;
audio/x-pn-realaudio=gnome-mplayer.desktop;totem.desktop;
audio/x-pn-realaudio-plugin=gnome-mplayer.desktop;totem.desktop;
audio/x-pn-wav=totem.desktop;
audio/x-pn-windows-acm=totem.desktop;
audio/x-real-audio=totem.desktop;
audio/x-realaudio=gnome-mplayer.desktop;totem.desktop;
audio/x-s3m=gnome-mplayer.desktop;totem.desktop;
audio/x-sbc=totem.desktop;
audio/x-scpls=gnome-mplayer.desktop;totem.desktop;
audio/x-speex=totem.desktop;
audio/x-stm=totem.desktop;
audio/x-tta=totem.desktop;
audio/x-vorbis=gnome-mplayer.desktop;totem.desktop;
audio/x-vorbis+ogg=gnome-mplayer.desktop;totem.desktop;
audio/x-wav=gnome-mplayer.desktop;totem.desktop;
audio/x-wavpack=totem.desktop;
audio/x-webm=gnome-mplayer.desktop;
audio/x-xm=gnome-mplayer.desktop;totem.desktop;
image/bmp=viewnior.desktop;
image/gif=viewnior.desktop;
image/jpeg=viewnior.desktop;
image/jpg=viewnior.desktop;
image/pjpeg=viewnior.desktop;
image/png=viewnior.desktop;
image/svg+xml=viewnior.desktop;
image/svg+xml-compressed=viewnior.desktop;
image/tiff=viewnior.desktop;evince.desktop;
image/vnd.djvu=evince.desktop;
image/vnd.rn-realpix=totem.desktop;
image/vnd.wap.wbmp=viewnior.desktop;
image/x-bmp=viewnior.desktop;
image/x-bzeps=evince.desktop;
image/x-eps=evince.desktop;
image/x-gray=viewnior.desktop;
image/x-gzeps=evince.desktop;
image/x-icb=viewnior.desktop;
image/x-ico=viewnior.desktop;
image/x-pcx=viewnior.desktop;
image/x-pict=totem.desktop;
image/x-png=viewnior.desktop;
image/x-portable-anymap=viewnior.desktop;
image/x-portable-bitmap=viewnior.desktop;
image/x-portable-graymap=viewnior.desktop;
image/x-portable-pixmap=viewnior.desktop;
image/x-xbitmap=viewnior.desktop;
image/x-xpixmap=viewnior.desktop;
inode/directory=Thunar-folder-handler.desktop;
misc/ultravox=totem.desktop;
text/css=geany.desktop;
text/csv=gnumeric.desktop;
text/google-video-pointer=totem.desktop;
text/html=mozilla-firefox.desktop;geany.desktop;
text/plain=geany.desktop;
text/spreadsheet=gnumeric.desktop;
text/tab-separated-values=gnumeric.desktop;
text/x-c++hdr=geany.desktop;
text/x-c++src=geany.desktop;
text/x-chdr=geany.desktop;
text/x-csrc=geany.desktop;
text/x-csv=gnumeric.desktop;
text/x-diff=geany.desktop;
text/x-dsrc=geany.desktop;
text/x-google-video-pointer=totem.desktop;
text/x-java=geany.desktop;
text/x-pascal=geany.desktop;
text/x-perl=geany.desktop;
text/x-python=geany.desktop;
text/x-sql=geany.desktop;
video/3gp=totem.desktop;
video/3gpp=gnome-mplayer.desktop;totem.desktop;
video/anim=ffconvert.desktop;
video/divx=totem.desktop;
video/dv=totem.desktop;
video/fli=gnome-mplayer.desktop;totem.desktop;
video/flv=totem.desktop;
video/matroska=gnome-mplayer.desktop;
video/mkv=ffconvert.desktop;
video/mng=ffconvert.desktop;
video/mp2t=gnome-mplayer.desktop;totem.desktop;
video/mp4=gnome-mplayer.desktop;ffconvert.desktop;totem.desktop;
video/mp4v-es=totem.desktop;
video/mpeg=gnome-mplayer.desktop;ffconvert.desktop;totem.desktop;
video/msvideo=gnome-mplayer.desktop;ffconvert.desktop;totem.desktop;
video/ogg=ffconvert.desktop;totem.desktop;
video/quicktime=gnome-mplayer.desktop;ffconvert.desktop;totem.desktop;
video/vivo=totem.desktop;
video/vnd.divx=totem.desktop;
video/vnd.mpegurl=gnome-mplayer.desktop;totem.desktop;
video/vnd.rn-realvideo=gnome-mplayer.desktop;totem.desktop;
video/vnd.vivo=gnome-mplayer.desktop;totem.desktop;
video/webm=gnome-mplayer.desktop;totem.desktop;
video/x-anim=ffconvert.desktop;totem.desktop;
video/x-avi=totem.desktop;
video/x-flc=totem.desktop;
video/x-fli=gnome-mplayer.desktop;totem.desktop;
video/x-flic=ffconvert.desktop;totem.desktop;
video/x-flv=gnome-mplayer.desktop;ffconvert.desktop;totem.desktop;
video/x-m4v=totem.desktop;
video/x-matroska=gnome-mplayer.desktop;totem.desktop;
video/x-mng=gnome-mplayer.desktop;ffconvert.desktop;
video/x-mpeg=gnome-mplayer.desktop;ffconvert.desktop;totem.desktop;
video/x-mpeg2=gnome-mplayer.desktop;totem.desktop;
video/x-ms-asf=gnome-mplayer.desktop;ffconvert.desktop;totem.desktop;
video/x-ms-asf-plugin=gnome-mplayer.desktop;ffconvert.desktop;
video/x-ms-asx=totem.desktop;
video/x-ms-wax=ffconvert.desktop;
video/x-ms-wm=gnome-mplayer.desktop;totem.desktop;
video/x-ms-wmp=gnome-mplayer.desktop;
video/x-ms-wmv=gnome-mplayer.desktop;ffconvert.desktop;totem.desktop;
video/x-ms-wmx=totem.desktop;
video/x-ms-wvx=gnome-mplayer.desktop;ffconvert.desktop;totem.desktop;
video/x-msvideo=gnome-mplayer.desktop;ffconvert.desktop;totem.desktop;
video/x-nsv=totem.desktop;
video/x-ogm+ogg=gnome-mplayer.desktop;totem.desktop;
video/x-quicktime=gnome-mplayer.desktop;ffconvert.desktop;
video/x-theora+ogg=totem.desktop;
video/x-totem-stream=totem.desktop;
video/x-webm=gnome-mplayer.desktop;
x-content/video-dvd=totem.desktop;
x-content/video-svcd=totem.desktop;
x-content/video-vcd=totem.desktop;
x-scheme-handler/icy=totem.desktop;
x-scheme-handler/icyx=totem.desktop;
x-scheme-handler/magnet=transmission-gtk.desktop;
x-scheme-handler/mms=totem.desktop;
x-scheme-handler/mmsh=totem.desktop;
x-scheme-handler/net=totem.desktop;
x-scheme-handler/pnm=totem.desktop;
x-scheme-handler/rtmp=totem.desktop;
x-scheme-handler/rtp=totem.desktop;
x-scheme-handler/rtsp=totem.desktop;
x-scheme-handler/uvox=totem.desktop;
zz-application/zz-winassoc-xls=gnumeric.desktop;