diff --git a/native/atom_application.mm b/native/atom_application.mm
index 869bddcfa..1793a239b 100644
--- a/native/atom_application.mm
+++ b/native/atom_application.mm
@@ -131,6 +131,10 @@
   [[AtomWindowController alloc] initWithPath:path];
 }
 
+- (void)openUnstable:(NSString *)path {
+  [[AtomWindowController alloc] initUnstableWithPath:path];
+}
+
 - (IBAction)runSpecs:(id)sender {
   [self runSpecsThenExit:NO];
 }
diff --git a/native/atom_cef_client.cpp b/native/atom_cef_client.cpp
index 216127846..e36215144 100644
--- a/native/atom_cef_client.cpp
+++ b/native/atom_cef_client.cpp
@@ -34,6 +34,10 @@ bool AtomCefClient::OnProcessMessageReceived(CefRefPtr<CefBrowser> browser,
     bool hasArguments = argumentList->GetSize() > 1;
     hasArguments ? Open(argumentList->GetString(1)) : Open();
   }
+  if (name == "openUnstable") {
+    bool hasArguments = argumentList->GetSize() > 1;
+    hasArguments ? OpenUnstable(argumentList->GetString(1)) : OpenUnstable();
+  }
   else if (name == "newWindow") {
     NewWindow();
   }
diff --git a/native/atom_cef_client.h b/native/atom_cef_client.h
index ae1f6219b..92c3784bb 100644
--- a/native/atom_cef_client.h
+++ b/native/atom_cef_client.h
@@ -107,6 +107,9 @@ class AtomCefClient : public CefClient,
   void FocusNextWindow();
   void Open(std::string path);
   void Open();
+  void OpenUnstable(std::string path);
+
+                        void OpenUnstable();
   void NewWindow();
   void ToggleDevTools(CefRefPtr<CefBrowser> browser);
   void ShowDevTools(CefRefPtr<CefBrowser> browser);
diff --git a/native/atom_cef_client_mac.mm b/native/atom_cef_client_mac.mm
index 6533b29bb..628017009 100644
--- a/native/atom_cef_client_mac.mm
+++ b/native/atom_cef_client_mac.mm
@@ -37,6 +37,20 @@ void AtomCefClient::Open() {
   }
 }
 
+void AtomCefClient::OpenUnstable(std::string path) {
+  NSString *pathString = [NSString stringWithCString:path.c_str() encoding:NSUTF8StringEncoding];
+  [(AtomApplication *)[AtomApplication sharedApplication] openUnstable:pathString];
+}
+
+void AtomCefClient::OpenUnstable() {
+  NSOpenPanel *panel = [NSOpenPanel openPanel];
+  [panel setCanChooseDirectories:YES];
+  if ([panel runModal] == NSFileHandlingPanelOKButton) {
+    NSURL *url = [[panel URLs] lastObject];
+    OpenUnstable([[url path] UTF8String]);
+  }
+}
+
 void AtomCefClient::NewWindow() {
   [(AtomApplication *)[AtomApplication sharedApplication] open:nil];
 }
diff --git a/native/atom_window_controller.h b/native/atom_window_controller.h
index 1921ec066..e1f177d1c 100644
--- a/native/atom_window_controller.h
+++ b/native/atom_window_controller.h
@@ -23,6 +23,7 @@ class AtomCefClient;
 @property (nonatomic, retain) IBOutlet NSView *devToolsView;
 
 - (id)initWithPath:(NSString *)path;
+- (id)initUnstableWithPath:(NSString *)path;
 - (id)initInBackground;
 - (id)initSpecsThenExit:(BOOL)exitWhenDone;
 - (id)initBenchmarksThenExit:(BOOL)exitWhenDone;
diff --git a/native/atom_window_controller.mm b/native/atom_window_controller.mm
index 4a259f0fe..0aca7b6ea 100644
--- a/native/atom_window_controller.mm
+++ b/native/atom_window_controller.mm
@@ -52,6 +52,12 @@
   return [self initWithBootstrapScript:@"window-bootstrap" background:NO alwaysUseBundleResourcePath:stable];
 }
 
+- (id)initUnstableWithPath:(NSString *)path {
+  _pathToOpen = [path retain];
+  AtomApplication *atomApplication = (AtomApplication *)[AtomApplication sharedApplication];
+  return [self initWithBootstrapScript:@"window-bootstrap" background:NO alwaysUseBundleResourcePath:false];
+}
+
 - (id)initInBackground {
   AtomApplication *atomApplication = (AtomApplication *)[AtomApplication sharedApplication];
   BOOL stable = [atomApplication.arguments objectForKey:@"stable"] != nil;
diff --git a/src/app/atom.coffee b/src/app/atom.coffee
index 96571194f..1b3860f2a 100644
--- a/src/app/atom.coffee
+++ b/src/app/atom.coffee
@@ -25,6 +25,9 @@ atom.receiveMessageFromBrowserProcess = (name, data) ->
 atom.open = (args...) ->
   @sendMessageToBrowserProcess('open', args)
 
+atom.openUnstable = (args...) ->
+  @sendMessageToBrowserProcess('openUnstable', args)
+
 atom.newWindow = (args...) ->
   @sendMessageToBrowserProcess('newWindow', args)
 
diff --git a/src/app/keymap.coffee b/src/app/keymap.coffee
index 462ccb85b..f08e1e364 100644
--- a/src/app/keymap.coffee
+++ b/src/app/keymap.coffee
@@ -20,11 +20,13 @@ class Keymap
       'meta-n': 'new-window'
       'meta-,': 'open-user-configuration'
       'meta-o': 'open'
+      'meta-O': 'open-unstable'
       'meta-w': 'core:close'
 
     $(document).on 'new-window', => atom.newWindow()
     $(document).on 'open-user-configuration', => atom.open(atom.configFilePath)
     $(document).on 'open', => atom.open()
+    $(document).on 'open-unstable', => atom.openUnstable()
 
   bindKeys: (selector, bindings) ->
     bindingSet = new BindingSet(selector, bindings, @bindingSets.length)