diff --git a/.gitignore b/.gitignore
index 050e95f3..4ae73d9a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -41,7 +41,6 @@
 
 /ide_plugins/vs/vs2015/SourcetrailPlugin/TestResults
 
-*.coatidb
 *.srctrldb
 *.srctrlbm
 *.suo
diff --git a/deployment/windows/wixSetup/installDir.wxs b/deployment/windows/wixSetup/installDir.wxs
index d38a07dc..c922a036 100644
--- a/deployment/windows/wixSetup/installDir.wxs
+++ b/deployment/windows/wixSetup/installDir.wxs
@@ -20,10 +20,6 @@
 						<Verb Id='open' Command='Open' Argument='"%1"' />
 						<MIME Advertise='yes' ContentType='application/sourcetrailproject' Default='yes' />
 					</Extension>
-					<Extension Id='coatiproject'>  <!-- ContentType='application/coatiproject' Advertise='no' -->
-						<Verb Id='open' Command='Open' Argument='"%1"' />
-						<MIME Advertise='yes' ContentType='application/coatiproject' Default='yes' />
-					</Extension>
 				</ProgId>
 			</Component>
 
diff --git a/setup/Linux/sourcetrail-mime.xml b/setup/Linux/sourcetrail-mime.xml
index 4af5e8ef..6481cd8b 100644
--- a/setup/Linux/sourcetrail-mime.xml
+++ b/setup/Linux/sourcetrail-mime.xml
@@ -5,12 +5,10 @@
 		<icon name="project-sourcetrail"/>
 		<glob-deleteall/>
 		<glob pattern="*.srctrlprj"/>
-		<glob pattern="*.coatiproject"/>
 	</mime-type>
     <mime-type type="application/x-sourcetrail">
 		<comment>Sourcetrail Database</comment>
 		<glob-deleteall/>
 		<glob pattern="*.srctrldb"/>
-		<glob pattern="*.coatidb"/>
 	</mime-type>
 </mime-info>
diff --git a/setup/macOS/bundle_info.plist.in b/setup/macOS/bundle_info.plist.in
index 470cd8e7..59756254 100644
--- a/setup/macOS/bundle_info.plist.in
+++ b/setup/macOS/bundle_info.plist.in
@@ -46,7 +46,6 @@
 			<key>CFBundleTypeExtensions</key>
 			<array>
 				<string>srctrlprj</string>
-				<string>coatiproject</string>
 			</array>
 			<key>CFBundleTypeIconFile</key>
 			<string>project</string>
diff --git a/src/lib/app/Application.cpp b/src/lib/app/Application.cpp
index 4f918356..72f88454 100644
--- a/src/lib/app/Application.cpp
+++ b/src/lib/app/Application.cpp
@@ -265,8 +265,6 @@ void Application::handleMessage(MessageLoadProject* message)
 	{
 		MessageStatus(L"Loading Project: " + projectSettingsFilePath.wstr(), false, true).dispatch();
 
-		projectSettingsFilePath = migrateProjectSettings(projectSettingsFilePath);
-
 		m_project.reset();
 
 		if (m_hasGUI)
@@ -359,36 +357,6 @@ void Application::handleMessage(MessageWindowFocus* message)
 	}
 }
 
-FilePath Application::migrateProjectSettings(const FilePath& projectSettingsFilePath) const
-{
-	if (projectSettingsFilePath.extension() == L".coatiproject")
-	{
-		MessageStatus(L"Migrating deprecated project file extension \".coatiproject\" to new file extension \".srctrlprj\"").dispatch();
-		const FilePath newSettingsPath = projectSettingsFilePath.replaceExtension(ProjectSettings::PROJECT_FILE_EXTENSION);
-		{
-			FileSystem::rename(projectSettingsFilePath, newSettingsPath);
-			const FilePath oldDbPath = projectSettingsFilePath.replaceExtension(L"coatidb");
-			if (oldDbPath.exists())
-			{
-				FileSystem::rename(oldDbPath, oldDbPath.replaceExtension(L"srctrldb"));
-			}
-		}
-		{
-			ApplicationSettings* appSettings = ApplicationSettings::getInstance().get();
-			std::vector<FilePath> recentProjects = appSettings->getRecentProjects();
-			std::vector<FilePath>::iterator it = std::find(recentProjects.begin(), recentProjects.end(), projectSettingsFilePath);
-			if (it != recentProjects.end())
-			{
-				recentProjects.erase(it);
-			}
-			appSettings->setRecentProjects(recentProjects);
-			appSettings->save(UserPaths::getAppSettingsPath());
-		}
-		return newSettingsPath;
-	}
-	return projectSettingsFilePath;
-}
-
 void Application::startMessagingAndScheduling()
 {
 	TaskManager::getScheduler(TabId::app())->startSchedulerLoopThreaded();
diff --git a/src/lib/app/Application.h b/src/lib/app/Application.h
index e1b2ec6d..0fcc71e6 100644
--- a/src/lib/app/Application.h
+++ b/src/lib/app/Application.h
@@ -74,7 +74,6 @@ private:
 	void handleMessage(MessageSwitchColorScheme* message) override;
 	void handleMessage(MessageWindowFocus* message) override;
 
-	FilePath migrateProjectSettings(const FilePath& projectSettingsFilePath) const;
 	void startMessagingAndScheduling();
 
 	void loadWindow(bool showStartWindow);
diff --git a/src/lib/utility/commandline/CommandLineParser.cpp b/src/lib/utility/commandline/CommandLineParser.cpp
index 6ca46345..7430ffe7 100644
--- a/src/lib/utility/commandline/CommandLineParser.cpp
+++ b/src/lib/utility/commandline/CommandLineParser.cpp
@@ -213,7 +213,7 @@ void CommandLineParser::processProjectfile()
 		return;
 	}
 
-	if (m_projectFile.extension() != L".srctrlprj" && m_projectFile.extension() != L".coatiproject")
+	if (m_projectFile.extension() != L".srctrlprj")
 	{
 		m_errorString = errorstring + L" has a wrong file ending";
 		m_projectFile = FilePath();
diff --git a/src/lib_gui/platform_includes/includesLinux.h b/src/lib_gui/platform_includes/includesLinux.h
index 0e66b6b0..01c9596d 100644
--- a/src/lib_gui/platform_includes/includesLinux.h
+++ b/src/lib_gui/platform_includes/includesLinux.h
@@ -47,21 +47,13 @@ void setupApp(int argc, char *argv[])
 	AppPath::setAppPath(FilePath(QCoreApplication::applicationDirPath().toStdWString() + L"/").getAbsolute());
 
 	std::string userdir(std::getenv("HOME"));
-	QDir coatiDir((userdir + "/.config/coati").c_str());
 	userdir.append("/.config/sourcetrail/");
 
 	QString userDataPath(userdir.c_str());
 	QDir dataDir(userdir.c_str());
 	if (!dataDir.exists())
 	{
-		if (coatiDir.exists())
-		{
-			utility::copyNewFilesFromDirectory(coatiDir.absolutePath(), userDataPath);
-		}
-		else
-		{
-			dataDir.mkpath(userDataPath);
-		}
+		dataDir.mkpath(userDataPath);
 	}
 
 	utility::copyNewFilesFromDirectory(QString::fromStdWString(ResourcePaths::getFallbackPath().wstr()), userDataPath);
diff --git a/src/lib_gui/platform_includes/includesMac.h b/src/lib_gui/platform_includes/includesMac.h
index 43ed425d..d357fc23 100644
--- a/src/lib_gui/platform_includes/includesMac.h
+++ b/src/lib_gui/platform_includes/includesMac.h
@@ -64,18 +64,6 @@ void setupPlatform(int argc, char *argv[])
 	if (!dataDir.exists())
 	{
 		dataDir.mkpath(dataPath);
-
-		if (dataPath.endsWith("Sourcetrail"))
-		{
-			QString coatiDataPath = dataPath;
-			coatiDataPath.append("/../Coati");
-
-			QDir coatiDataDir(coatiDataPath);
-			if (coatiDataDir.exists())
-			{
-				oldDataPath = coatiDataPath;
-			}
-		}
 	}
 
 	utility::copyNewFilesFromDirectory(oldDataPath, dataPath);
diff --git a/src/lib_gui/qt/QtApplication.cpp b/src/lib_gui/qt/QtApplication.cpp
index 1e1c7318..ecc3ae08 100644
--- a/src/lib_gui/qt/QtApplication.cpp
+++ b/src/lib_gui/qt/QtApplication.cpp
@@ -28,7 +28,7 @@ bool QtApplication::event(QEvent *event)
 
 		FilePath path(fileEvent->file().toStdWString());
 
-		if (path.exists() && (path.extension() == L".srctrlprj" || path.extension() == L".coatiproject"))
+		if (path.exists() && path.extension() == L".srctrlprj")
 		{
 			MessageLoadProject(path).dispatch();
 			return true;
diff --git a/src/lib_gui/qt/window/QtMainWindow.cpp b/src/lib_gui/qt/window/QtMainWindow.cpp
index 2125c132..aece5c02 100644
--- a/src/lib_gui/qt/window/QtMainWindow.cpp
+++ b/src/lib_gui/qt/window/QtMainWindow.cpp
@@ -597,7 +597,7 @@ void QtMainWindow::newProjectFromCDB(const FilePath& filePath)
 void QtMainWindow::openProject()
 {
 	QString fileName = QtFileDialog::getOpenFileName(
-		this, tr("Open File"), FilePath(), "Sourcetrail Project Files (*.srctrlprj *.coatiproject)");
+		this, tr("Open File"), FilePath(), "Sourcetrail Project Files (*.srctrlprj)");
 
 	if (!fileName.isEmpty())
 	{