diff -up lyx-2.0.0alpha1/lib/configure.py.xdg_open lyx-2.0.0alpha1/lib/configure.py
--- lyx-2.0.0alpha1/lib/configure.py.xdg_open	2010-01-07 12:01:35.000000000 -0600
+++ lyx-2.0.0alpha1/lib/configure.py	2010-04-05 10:24:27.030780940 -0500
@@ -459,7 +459,7 @@ 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"	""
@@ -515,7 +515,7 @@ def checkFormatEntries(dtl_tools):  
 \Format text4      txt    "Plain text (catdvi)"   "" ""	"%%"	"document"
 \Format textparagraph txt "Plain Text, Join Lines" "" ""	"%%"	"document"''' ])
  #
-    path, xhtmlview = checkViewer('an HTML previewer', ['firefox', 'mozilla file://$$p$$i', 'netscape'],
+    path, xhtmlview = checkViewer('an HTML previewer', ['xdg-open', 'htmlview', 'firefox', 'mozilla file://$$p$$i', 'netscape'],
         rc_entry = [r'\Format xhtml      xhtml   "LyXHTML"              X "%%" ""    "document"'])
     if xhtmlview == "":
         addToRC(r'\Format xhtml      xhtml   "LyXHTML"              X "" ""  "document"')
@@ -529,18 +529,18 @@ 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"
 \Format pdf3       pdf    "PDF (dvipdfm)"         m  "%%"	""	"document,vector"
 \Format pdf4       pdf    "PDF (XeTeX)"           X  "%%"	""	"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"'])
     if dtl_tools:
         # Windows only: DraftDVI