diff --git a/src/frontends/Alert.C b/src/frontends/Alert.cpp
similarity index 100%
rename from src/frontends/Alert.C
rename to src/frontends/Alert.cpp
diff --git a/src/frontends/Application.C b/src/frontends/Application.cpp
similarity index 100%
rename from src/frontends/Application.C
rename to src/frontends/Application.cpp
diff --git a/src/frontends/Dialogs.C b/src/frontends/Dialogs.cpp
similarity index 100%
rename from src/frontends/Dialogs.C
rename to src/frontends/Dialogs.cpp
diff --git a/src/frontends/LyXView.C b/src/frontends/LyXView.cpp
similarity index 100%
rename from src/frontends/LyXView.C
rename to src/frontends/LyXView.cpp
diff --git a/src/frontends/Painter.C b/src/frontends/Painter.cpp
similarity index 100%
rename from src/frontends/Painter.C
rename to src/frontends/Painter.cpp
diff --git a/src/frontends/Timeout.C b/src/frontends/Timeout.cpp
similarity index 100%
rename from src/frontends/Timeout.C
rename to src/frontends/Timeout.cpp
diff --git a/src/frontends/Toolbars.C b/src/frontends/Toolbars.cpp
similarity index 100%
rename from src/frontends/Toolbars.C
rename to src/frontends/Toolbars.cpp
diff --git a/src/frontends/WorkArea.C b/src/frontends/WorkArea.cpp
similarity index 100%
rename from src/frontends/WorkArea.C
rename to src/frontends/WorkArea.cpp