diff --git a/gpxsee.pro b/gpxsee.pro
index bd81a084..21e92f54 100644
--- a/gpxsee.pro
+++ b/gpxsee.pro
@@ -408,7 +408,8 @@ win32 {
         icons/formats/slf.ico \
         icons/formats/json.ico \
         icons/formats/cup.ico \
-        icons/formats/gpi.ico
+        icons/formats/gpi.ico \
+        icons/formats/sml.ico
     DEFINES += _USE_MATH_DEFINES \
         NOGDI
 }
diff --git a/icons/scripts/extensions b/icons/scripts/extensions
index 3d1350bf..7cdaa12c 100644
--- a/icons/scripts/extensions
+++ b/icons/scripts/extensions
@@ -12,3 +12,4 @@ loc:#556677
 slf:#881199
 cup:#20a810
 gpi:#fca314
+sml:#6434eb
diff --git a/pkg/gpxsee.nsi b/pkg/gpxsee.nsi
index 12cf1a01..63c1dd02 100644
--- a/pkg/gpxsee.nsi
+++ b/pkg/gpxsee.nsi
@@ -106,20 +106,21 @@ Section "GPXSee" SEC_APP
 
   ; Associate file formats
   DetailPrint "Associating file types..."
-  !insertmacro FILE_ASSOCIATION_ADD "gpx" "GPS Exchange Format" 7
-  !insertmacro FILE_ASSOCIATION_ADD "tcx" "Training Center XML" 8
-  !insertmacro FILE_ASSOCIATION_ADD "kml" "Keyhole Markup Language" 9
-  !insertmacro FILE_ASSOCIATION_ADD "fit" "Flexible and Interoperable Data Transfer" 10
-  !insertmacro FILE_ASSOCIATION_ADD "igc" "Flight Recorder Data Format" 11
-  !insertmacro FILE_ASSOCIATION_ADD "nmea" "NMEA 0183 Data" 12
-  !insertmacro FILE_ASSOCIATION_ADD "plt" "OziExplorer Track Point File" 13
-  !insertmacro FILE_ASSOCIATION_ADD "rte" "OziExplorer Route File" 14
+  !insertmacro FILE_ASSOCIATION_ADD "gpx" "GPS Exchange Format" 8
+  !insertmacro FILE_ASSOCIATION_ADD "tcx" "Training Center XML" 9
+  !insertmacro FILE_ASSOCIATION_ADD "kml" "Keyhole Markup Language" 10
+  !insertmacro FILE_ASSOCIATION_ADD "fit" "Flexible and Interoperable Data Transfer" 11
+  !insertmacro FILE_ASSOCIATION_ADD "igc" "Flight Recorder Data Format" 12
+  !insertmacro FILE_ASSOCIATION_ADD "nmea" "NMEA 0183 Data" 13
+  !insertmacro FILE_ASSOCIATION_ADD "plt" "OziExplorer Track Point File" 14
+  !insertmacro FILE_ASSOCIATION_ADD "rte" "OziExplorer Route File" 15
   !insertmacro FILE_ASSOCIATION_ADD "wpt" "OziExplorer Waypoint File" 1
   !insertmacro FILE_ASSOCIATION_ADD "loc" "Geocaching.com Waypoint File" 2
   !insertmacro FILE_ASSOCIATION_ADD "slf" "Sigma Log File" 3
   !insertmacro FILE_ASSOCIATION_ADD "geojson" "GeoJSON" 4
   !insertmacro FILE_ASSOCIATION_ADD "cup" "SeeYou CUP File" 5
   !insertmacro FILE_ASSOCIATION_ADD "gpi" "Garmin POI File" 6
+  !insertmacro FILE_ASSOCIATION_ADD "sml" "Suunto Markup Language" 7
   System::Call 'shell32.dll::SHChangeNotify(i, i, i, i) v (0x08000000, 0, 0, 0)'
 
 SectionEnd
@@ -232,6 +233,7 @@ Section "Uninstall"
   !insertmacro FILE_ASSOCIATION_REMOVE "geojson"
   !insertmacro FILE_ASSOCIATION_REMOVE "cup"
   !insertmacro FILE_ASSOCIATION_REMOVE "gpi"
+  !insertmacro FILE_ASSOCIATION_REMOVE "sml"
   System::Call 'shell32.dll::SHChangeNotify(i, i, i, i) v (0x08000000, 0, 0, 0)'
 
 SectionEnd
@@ -262,4 +264,4 @@ LangString DESC_LOCALIZATION ${LANG_ENGLISH} \
   !insertmacro MUI_DESCRIPTION_TEXT ${SEC_MSVC} $(DESC_MSVC) 
   !insertmacro MUI_DESCRIPTION_TEXT ${SEC_APP} $(DESC_APP)
   !insertmacro MUI_DESCRIPTION_TEXT ${SEC_LOCALIZATION} $(DESC_LOCALIZATION)
-!insertmacro MUI_FUNCTION_DESCRIPTION_END
+!insertmacro MUI_FUNCTION_DESCRIPTION_END
\ No newline at end of file
diff --git a/pkg/gpxsee.xml b/pkg/gpxsee.xml
index ea8bc329..d5f10506 100644
--- a/pkg/gpxsee.xml
+++ b/pkg/gpxsee.xml
@@ -98,4 +98,11 @@
 		<generic-icon name="application/octet-stream"/>
 		<glob pattern="*.gpi"/>
 	</mime-type>
+
+	<mime-type type="application/sml+xml">
+		<comment>Suunto Markup Language</comment>
+		<sub-class-of type="application/xml"/>
+		<generic-icon name="application-xml"/>
+		<glob pattern="*.sml"/>
+	</mime-type>
 </mime-info>
diff --git a/pkg/gpxsee64.nsi b/pkg/gpxsee64.nsi
index 0e195dde..8d2fd859 100644
--- a/pkg/gpxsee64.nsi
+++ b/pkg/gpxsee64.nsi
@@ -113,20 +113,21 @@ Section "GPXSee" SEC_APP
 
   ; Associate file formats
   DetailPrint "Associating file types..."
-  !insertmacro FILE_ASSOCIATION_ADD "gpx" "GPS Exchange Format" 7
-  !insertmacro FILE_ASSOCIATION_ADD "tcx" "Training Center XML" 8
-  !insertmacro FILE_ASSOCIATION_ADD "kml" "Keyhole Markup Language" 9
-  !insertmacro FILE_ASSOCIATION_ADD "fit" "Flexible and Interoperable Data Transfer" 10
-  !insertmacro FILE_ASSOCIATION_ADD "igc" "Flight Recorder Data Format" 11
-  !insertmacro FILE_ASSOCIATION_ADD "nmea" "NMEA 0183 Data" 12
-  !insertmacro FILE_ASSOCIATION_ADD "plt" "OziExplorer Track Point File" 13
-  !insertmacro FILE_ASSOCIATION_ADD "rte" "OziExplorer Route File" 14
+  !insertmacro FILE_ASSOCIATION_ADD "gpx" "GPS Exchange Format" 8
+  !insertmacro FILE_ASSOCIATION_ADD "tcx" "Training Center XML" 9
+  !insertmacro FILE_ASSOCIATION_ADD "kml" "Keyhole Markup Language" 10
+  !insertmacro FILE_ASSOCIATION_ADD "fit" "Flexible and Interoperable Data Transfer" 11
+  !insertmacro FILE_ASSOCIATION_ADD "igc" "Flight Recorder Data Format" 12
+  !insertmacro FILE_ASSOCIATION_ADD "nmea" "NMEA 0183 Data" 13
+  !insertmacro FILE_ASSOCIATION_ADD "plt" "OziExplorer Track Point File" 14
+  !insertmacro FILE_ASSOCIATION_ADD "rte" "OziExplorer Route File" 15
   !insertmacro FILE_ASSOCIATION_ADD "wpt" "OziExplorer Waypoint File" 1
   !insertmacro FILE_ASSOCIATION_ADD "loc" "Geocaching.com Waypoint File" 2
   !insertmacro FILE_ASSOCIATION_ADD "slf" "Sigma Log File" 3
   !insertmacro FILE_ASSOCIATION_ADD "geojson" "GeoJSON" 4
   !insertmacro FILE_ASSOCIATION_ADD "cup" "SeeYou CUP File" 5
   !insertmacro FILE_ASSOCIATION_ADD "gpi" "Garmin POI File" 6
+  !insertmacro FILE_ASSOCIATION_ADD "sml" "Suunto Markup Language" 7
   System::Call 'shell32.dll::SHChangeNotify(i, i, i, i) v (0x08000000, 0, 0, 0)'
 
 SectionEnd
@@ -235,6 +236,7 @@ Section "Uninstall"
   !insertmacro FILE_ASSOCIATION_REMOVE "geojson"
   !insertmacro FILE_ASSOCIATION_REMOVE "cup"
   !insertmacro FILE_ASSOCIATION_REMOVE "gpi"
+  !insertmacro FILE_ASSOCIATION_REMOVE "sml"
   System::Call 'shell32.dll::SHChangeNotify(i, i, i, i) v (0x08000000, 0, 0, 0)'
 
 SectionEnd
@@ -265,4 +267,4 @@ LangString DESC_LOCALIZATION ${LANG_ENGLISH} \
   !insertmacro MUI_DESCRIPTION_TEXT ${SEC_MSVC} $(DESC_MSVC) 
   !insertmacro MUI_DESCRIPTION_TEXT ${SEC_APP} $(DESC_APP)
   !insertmacro MUI_DESCRIPTION_TEXT ${SEC_LOCALIZATION} $(DESC_LOCALIZATION)
-!insertmacro MUI_FUNCTION_DESCRIPTION_END
+!insertmacro MUI_FUNCTION_DESCRIPTION_END
\ No newline at end of file