diff --git a/skel_common/readme_changelog.txt b/skel_common/readme_changelog.txt
index 37ac7f9..e1b3302 100644
--- a/skel_common/readme_changelog.txt
+++ b/skel_common/readme_changelog.txt
@@ -9,6 +9,7 @@ Changelog
 - Changed modman.exe to fail rather than use VirtualStore
 - Added modman_admin.exe, which always runs as administrator
 - Added a Validate warning for junk files whose names end with a tilde
+- Added an error popup when the jar is double-clicked
 - Minor optimizations to reduce memory usage
 
 1.4:
diff --git a/src/main/java/net/vhati/modmanager/FTLModManager.java b/src/main/java/net/vhati/modmanager/FTLModManager.java
index 341e143..3f5c00b 100644
--- a/src/main/java/net/vhati/modmanager/FTLModManager.java
+++ b/src/main/java/net/vhati/modmanager/FTLModManager.java
@@ -51,6 +51,14 @@ public class FTLModManager {
 		log.debug( String.format( "%s %s", System.getProperty("os.name"), System.getProperty("os.version") ) );
 		log.debug( String.format( "%s, %s, %s", System.getProperty("java.vm.name"), System.getProperty("java.version"), System.getProperty("os.arch") ) );
 
+		// Nag if the jar was double-clicked.
+		if ( new File("./mods/").exists() == false ) {
+			String currentPath = new File(".").getAbsoluteFile().getParentFile().getAbsolutePath();
+			showErrorDialog( String.format( "Slipstream could not find its own folder.\nCurrently in: %s\n\nRun one of the following instead of the jar...\nWindows: modman.exe or modman_admin.exe\nLinux/OSX: modman.command or modman-cli.sh\n\nThe Mod Manager will now exit.", currentPath ) );
+			System.err.println( String.format( "Slipstream could not find its own folder (Currently in \"%s\"), exiting.", currentPath ) );
+			System.exit( 1 );
+		}
+
 
 		File configFile = new File( "modman.cfg" );