diff -up lyx-2.0.0beta3/lib/configure.py.xdg_open lyx-2.0.0beta3/lib/configure.py
--- lyx-2.0.0beta3/lib/configure.py.xdg_open	2011-01-07 16:12:01.000000000 -0600
+++ lyx-2.0.0beta3/lib/configure.py	2011-01-11 10:50:20.084008478 -0600
@@ -458,7 +458,7 @@ def checkFormatEntries(dtl_tools):  
     checkViewerEditor('a SVG viewer and editor', ['inkscape'],
         rc_entry = [r'\Format svg        svg     SVG                    "" "%%" "%%"	"vector"'])
     #
-    path, iv = checkViewerNoRC('a raster image viewer', ['xv', 'kview', 'gimp-remote', 'gimp'],
+    path, iv = checkViewerNoRC('a raster image viewer', ['xdg-open', 'xv', 'kview', 'gimp-remote', 'gimp'],
         rc_entry = [r'''\Format bmp        bmp     BMP                    "" "%s"	"%s"	""
 \Format gif        gif     GIF                    "" "%s"	"%s"	""
 \Format jpg        jpg     JPEG                   "" "%s"	"%s"	""
@@ -521,7 +521,7 @@ def checkFormatEntries(dtl_tools):  
 \Format excel      xls    "Excel spreadsheet"      "" "" "%%"    "document" 
 \Format oocalc     ods    "OpenOffice spreadsheet" "" "" "%%"    "document"''']) 
  #
-    path, xhtmlview = checkViewer('an HTML previewer', ['firefox', 'mozilla file://$$p$$i', 'netscape'],
+    path, xhtmlview = checkViewer('an HTML previewer', ['xdg-open', 'firefox', 'mozilla file://$$p$$i', 'netscape'],
         rc_entry = [r'\Format xhtml      xhtml   "LyXHTML"              y "%%" ""    "document"'])
     if xhtmlview == "":
         addToRC(r'\Format xhtml      xhtml   "LyXHTML"              y "" ""  "document"')
@@ -535,11 +535,11 @@ def checkFormatEntries(dtl_tools):  
     #
     #checkProg('a Postscript interpreter', ['gs'],
     #  rc_entry = [ r'\ps_command "%%"' ])
-    checkViewer('a Postscript previewer', ['kghostview', 'okular', 'evince', 'gv', 'ghostview -swap'],
+    checkViewer('a Postscript previewer', ['xdg-open', 'kghostview', 'okular', 'evince', 'gv', 'ghostview -swap'],
         rc_entry = [r'''\Format eps        eps     EPS                    "" "%%"	""	"vector"
 \Format ps         ps      Postscript             t  "%%"	""	"document,vector"'''])
     # for xdg-open issues look here: http://www.mail-archive.com/lyx-devel@lists.lyx.org/msg151818.html
-    checkViewer('a PDF previewer', ['kpdf', 'okular', 'evince', 'kghostview', 'xpdf', 'acrobat', 'acroread', \
+    checkViewer('a PDF previewer', ['xdg-open', 'kpdf', 'okular', 'evince', 'kghostview', 'xpdf', 'acrobat', 'acroread', \
 		    'gv', 'ghostview'],
         rc_entry = [r'''\Format pdf        pdf    "PDF (ps2pdf)"          P  "%%"	""	"document,vector"
 \Format pdf2       pdf    "PDF (pdflatex)"        F  "%%"	""	"document,vector"
@@ -547,14 +547,14 @@ def checkFormatEntries(dtl_tools):  
 \Format pdf4       pdf    "PDF (XeTeX)"           X  "%%"	""	"document,vector"
 \Format pdf5       pdf    "PDF (LuaTeX)"          u  "%%"	""	"document,vector"'''])
     #
-    checkViewer('a DVI previewer', ['xdvi', 'kdvi', 'okular', 'yap', 'dviout -Set=!m'],
+    checkViewer('a DVI previewer', ['xdg-open' 'xdvi', 'kdvi', 'okular', 'yap', 'dviout -Set=!m'],
         rc_entry = [r'''\Format dvi        dvi     DVI                    D  "%%"	""	"document,vector"
 \Format dvi3       dvi     "DVI (LuaTeX)"          V  "%%"	""	"document,vector"'''])
     if dtl_tools:
         # Windows only: DraftDVI
         addToRC(r'\Format dvi2       dvi     DraftDVI               ""	""	""	"vector"')
     #
-    checkViewer('an HTML previewer', ['firefox', 'mozilla file://$$p$$i', 'netscape'],
+    checkViewer('an HTML previewer', ['xdg-open', 'firefox', 'mozilla file://$$p$$i', 'netscape'],
         rc_entry = [r'\Format html       html    HTML                   H  "%%"	""	"document"'])
     #
     checkViewerEditor('Noteedit', ['noteedit'],