diff --git a/Info.plist b/Info.plist
index 2f71577b..f541556d 100644
--- a/Info.plist
+++ b/Info.plist
@@ -74,7 +74,7 @@
 			</array>
 			<key>CFBundleTypeMIMETypes</key>
 			<array>
-				<string>application/octet-stream</string>
+				<string>application/vnd.ant.fit</string>
 			</array>
 			<key>CFBundleTypeIconFile</key>
 			<string>fit.icns</string>
@@ -83,6 +83,22 @@
 			<key>CFBundleTypeRole</key>
 			<string>Viewer</string>
 		</dict>
+		<dict>
+			<key>CFBundleTypeExtensions</key>
+			<array>
+				<string>igc</string>
+			</array>
+			<key>CFBundleTypeMIMETypes</key>
+			<array>
+				<string>application/vnd.fai.igc</string>
+			</array>
+			<key>CFBundleTypeIconFile</key>
+			<string>igc.icns</string>
+			<key>CFBundleTypeName</key>
+			<string>Flight Recorder Data Format</string>
+			<key>CFBundleTypeRole</key>
+			<string>Viewer</string>
+		</dict>
 	</array>
 
 	<key>UTImportedTypeDeclarations</key>
@@ -171,6 +187,27 @@
 				<string>application/vnd.ant.fit</string>
 			</dict>
 		</dict>
+		<dict>
+			<key>UTTypeIdentifier</key>
+			<string>org.fai.igc</string>
+			<key>UTTypeReferenceURL</key>
+			<string>http://www.fai.org/gnss-recording-devices/igc-approved-flight-recorders</string>
+			<key>UTTypeDescription</key>
+			<string>Flight Recorder Data Format</string>
+			<key>UTTypeConformsTo</key>
+			<array>
+				<string>public.data</string>
+			</array>
+			<key>UTTypeTagSpecification</key>
+			<dict>
+				<key>public.filename-extension</key>
+				<array>
+					<string>igc</string>
+				</array>
+				<key>public.mime-type</key>
+				<string>application/vnd.fai.igc</string>
+			</dict>
+		</dict>
 	</array>
 
 </dict>
diff --git a/gpxsee.pro b/gpxsee.pro
index 5ebeef96..9b41d85f 100644
--- a/gpxsee.pro
+++ b/gpxsee.pro
@@ -1,5 +1,5 @@
 TARGET = GPXSee
-VERSION = 3.0
+VERSION = 3.1
 QT += core \
     gui \
     network
@@ -128,6 +128,7 @@ macx {
         icons/tcx.icns \
         icons/kml.icns \
         icons/fit.icns \
+        icons/igc.icns \
         pkg/maps.txt
     APP_RESOURCES.path = Contents/Resources
     QMAKE_BUNDLE_DATA += APP_RESOURCES
@@ -137,6 +138,7 @@ win32 {
         icons/gpx.ico \
         icons/tcx.ico \
         icons/kml.ico \
-        icons/fit.ico
+        icons/fit.ico \
+        icons/igc.ico
 }
 DEFINES += APP_VERSION=\\\"$$VERSION\\\"
diff --git a/pkg/gpxsee.nsi b/pkg/gpxsee.nsi
index 4b322edf..71fbaa0d 100644
--- a/pkg/gpxsee.nsi
+++ b/pkg/gpxsee.nsi
@@ -4,7 +4,7 @@
 ; The name of the installer
 Name "GPXSee"
 ; Program version
-!define VERSION "3.0"
+!define VERSION "3.1"
 
 ; The file to write
 OutFile "GPXSee-${VERSION}.exe"
@@ -26,6 +26,7 @@ InstallDirRegKey HKLM "Software\GPXSee" "Install_Dir"
 !define REGTCX "GPXSee.tcx"
 !define REGKML "GPXSee.kml"
 !define REGFIT "GPXSee.fit"
+!define REGIGC "GPXSee.igc"
 
 ; Start menu page configuration
 !define MUI_STARTMENUPAGE_REGISTRY_ROOT "HKLM" 
@@ -107,7 +108,11 @@ Section "GPXSee (required)" SEC_APP
   WriteRegStr HKCR "${REGFIT}" ""  "Flexible and Interoperable Data Transfer"
   WriteRegStr HKCR "${REGFIT}\DefaultIcon" "" "$INSTDIR\GPXSee.exe,4"
   WriteRegStr HKCR "${REGFIT}\shell\open\command" "" "$\"$INSTDIR\GPXSee.exe$\" $\"%1$\""
-
+  WriteRegStr HKCR ".igc" "" "${REGIGC}"
+  WriteRegStr HKCR "${REGIGC}" ""  "Flight Recorder Data Format"
+  WriteRegStr HKCR "${REGIGC}\DefaultIcon" "" "$INSTDIR\GPXSee.exe,5"
+  WriteRegStr HKCR "${REGIGC}\shell\open\command" "" "$\"$INSTDIR\GPXSee.exe$\" $\"%1$\""
+  
   System::Call 'shell32.dll::SHChangeNotify(i, i, i, i) v (0x08000000, 0, 0, 0)'
 
 SectionEnd
@@ -175,6 +180,8 @@ Section "Uninstall"
   DeleteRegKey HKCR ".kml"
   DeleteRegKey HKCR "${REGFIT}"
   DeleteRegKey HKCR ".fit"
+  DeleteRegKey HKCR "${REGIGC}"
+  DeleteRegKey HKCR ".igc"
   System::Call 'shell32.dll::SHChangeNotify(i, i, i, i) v (0x08000000, 0, 0, 0)'  
 
 SectionEnd
diff --git a/pkg/gpxsee64.nsi b/pkg/gpxsee64.nsi
index 0f74e986..290385a8 100644
--- a/pkg/gpxsee64.nsi
+++ b/pkg/gpxsee64.nsi
@@ -4,7 +4,7 @@
 ; The name of the installer
 Name "GPXSee"
 ; Program version
-!define VERSION "3.0"
+!define VERSION "3.1"
 
 ; The file to write
 OutFile "GPXSee-${VERSION}_x64.exe"
@@ -26,6 +26,7 @@ InstallDirRegKey HKLM "Software\GPXSee" "Install_Dir"
 !define REGTCX "GPXSee.tcx"
 !define REGKML "GPXSee.kml"
 !define REGFIT "GPXSee.fit"
+!define REGIGC "GPXSee.igc"
 
 ; Start menu page configuration
 !define MUI_STARTMENUPAGE_REGISTRY_ROOT "HKLM" 
@@ -115,7 +116,11 @@ Section "GPXSee (required)" SEC_APP
   WriteRegStr HKCR "${REGFIT}" ""  "Flexible and Interoperable Data Transfer"
   WriteRegStr HKCR "${REGFIT}\DefaultIcon" "" "$INSTDIR\GPXSee.exe,4"
   WriteRegStr HKCR "${REGFIT}\shell\open\command" "" "$\"$INSTDIR\GPXSee.exe$\" $\"%1$\""
-
+  WriteRegStr HKCR ".igc" "" "${REGIGC}"
+  WriteRegStr HKCR "${REGIGC}" ""  "Flight Recorder Data Format"
+  WriteRegStr HKCR "${REGIGC}\DefaultIcon" "" "$INSTDIR\GPXSee.exe,5"
+  WriteRegStr HKCR "${REGIGC}\shell\open\command" "" "$\"$INSTDIR\GPXSee.exe$\" $\"%1$\""
+  
   System::Call 'shell32.dll::SHChangeNotify(i, i, i, i) v (0x08000000, 0, 0, 0)'
 
 SectionEnd
@@ -179,6 +184,8 @@ Section "Uninstall"
   DeleteRegKey HKCR ".kml"
   DeleteRegKey HKCR "${REGFIT}"
   DeleteRegKey HKCR ".fit"
+  DeleteRegKey HKCR "${REGIGC}"
+  DeleteRegKey HKCR ".igc"
   System::Call 'shell32.dll::SHChangeNotify(i, i, i, i) v (0x08000000, 0, 0, 0)'
 
 SectionEnd