diff --git a/Ample/AppDelegate.m b/Ample/AppDelegate.m
index 0f502a8..649af10 100644
--- a/Ample/AppDelegate.m
+++ b/Ample/AppDelegate.m
@@ -13,6 +13,8 @@
 #import "DiskImagesWindowController.h"
 #import "Transformers.h"
 
+#import "LogWindowController.h"
+
 @interface AppDelegate ()
 @property (weak) IBOutlet NSWindow *installWindow;
 
@@ -139,6 +141,18 @@
 }
 
 
+-(BOOL)application:(NSApplication *)sender openFile:(NSString *)filename {
+    
+    NSString *ext = [[filename pathExtension] lowercaseString];
+    
+    if ([ext isEqualToString: @"vgm"] || [ext isEqualToString: @"vgz"]) {
+        // run mame...
+        NSArray *args = @[ @"vgmplay", @"-window", @"-nomax", @"-quik", filename ];
+        
+        [LogWindowController controllerForArgs: args];
+    }
+    return NO;
+}
 
 
 #pragma mark - IBActions
diff --git a/Ample/Info.plist b/Ample/Info.plist
index da8d412..8933896 100644
--- a/Ample/Info.plist
+++ b/Ample/Info.plist
@@ -4,6 +4,33 @@
 <dict>
 	<key>CFBundleDevelopmentRegion</key>
 	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleDocumentTypes</key>
+	<array>
+		<dict>
+			<key>CFBundleTypeExtensions</key>
+			<array>
+				<string>vgm</string>
+			</array>
+			<key>CFBundleTypeName</key>
+			<string>Video Game Music</string>
+			<key>CFBundleTypeRole</key>
+			<string>Viewer</string>
+			<key>LSTypeIsPackage</key>
+			<integer>0</integer>
+		</dict>
+		<dict>
+			<key>CFBundleTypeExtensions</key>
+			<array>
+				<string>vgz</string>
+			</array>
+			<key>CFBundleTypeName</key>
+			<string>Video Game Music</string>
+			<key>CFBundleTypeRole</key>
+			<string>Viewer</string>
+			<key>LSTypeIsPackage</key>
+			<integer>0</integer>
+		</dict>
+	</array>
 	<key>CFBundleExecutable</key>
 	<string>$(EXECUTABLE_NAME)</string>
 	<key>CFBundleIconFile</key>
diff --git a/Ample/LogWindowController.h b/Ample/LogWindowController.h
index cd7a4d5..a94c1a3 100644
--- a/Ample/LogWindowController.h
+++ b/Ample/LogWindowController.h
@@ -13,7 +13,7 @@ NS_ASSUME_NONNULL_BEGIN
 @interface LogWindowController : NSWindowController <NSWindowDelegate>
 
 +(id)controllerForTask: (NSTask *)task;
-
++(id)controllerForArgs: (NSArray *)args;
 @end
 
 NS_ASSUME_NONNULL_END
diff --git a/Ample/LogWindowController.m b/Ample/LogWindowController.m
index ff201f5..f6ef0ef 100644
--- a/Ample/LogWindowController.m
+++ b/Ample/LogWindowController.m
@@ -36,6 +36,50 @@ static NSMutableSet *LogWindows;
     return controller;
 }
 
+static NSURL *MameURL(void) {
+
+    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
+    NSBundle *bundle = [NSBundle mainBundle];
+        
+    if ([defaults boolForKey: kUseCustomMame]) {
+        NSString *path = [defaults stringForKey: kMamePath];
+        if (![path length]) return [NSURL fileURLWithPath: path];
+    }
+    
+    return [bundle URLForAuxiliaryExecutable: @"mame64"];
+
+    return nil;
+}
+
++(id)controllerForArgs: (NSArray *)args {
+    
+    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
+
+    NSURL *url = MameURL();
+
+    if (!url) {
+        NSAlert *alert = [NSAlert new];
+
+        [alert setMessageText: @"Unable to find MAME executable path"];
+        [alert runModal];
+        return nil;
+    }
+    
+
+    NSTask *task = [NSTask new];
+    [task setExecutableURL: url];
+    [task setArguments: args];
+
+    if (![defaults boolForKey: kUseCustomMame]) {
+        // run in Application Support/Ample.
+        [task setCurrentDirectoryURL: SupportDirectory()];
+    }
+    
+    return [LogWindowController controllerForTask: task];
+
+    
+}
+
 - (void)windowDidLoad {
     [super windowDidLoad];