--- a/PDFViewer/Base.lproj/Main.storyboard
+++ b/PDFViewer/Base.lproj/Main.storyboard
@@ -603,7 +603,7 @@
                 <customObject id="Voe-Tx-rLC" customClass="AppDelegate"/>
                 <customObject id="Ady-hI-5gd" userLabel="First Responder" customClass="NSResponder" sceneMemberID="firstResponder"/>
             </objects>
-            <point key="canvasLocation" x="75" y="0.0"/>
+            <point key="canvasLocation" x="-171" y="-267"/>
         </scene>
         <!--Window Controller-->
         <scene sceneID="R2V-B0-nI4">
@@ -622,7 +622,7 @@
                 </windowController>
                 <customObject id="Oky-zY-oP4" userLabel="First Responder" customClass="NSResponder" sceneMemberID="firstResponder"/>
             </objects>
-            <point key="canvasLocation" x="-87" y="59"/>
+            <point key="canvasLocation" x="-103" y="107"/>
         </scene>
         <!--View Controller-->
         <scene sceneID="hIz-AP-VOD">
@@ -649,7 +649,7 @@
                 </viewController>
                 <customObject id="rPt-NT-nkU" userLabel="First Responder" customClass="NSResponder" sceneMemberID="firstResponder"/>
             </objects>
-            <point key="canvasLocation" x="-87" y="906"/>
+            <point key="canvasLocation" x="-103" y="912"/>
         </scene>
     </scenes>
 </document>

--- a/PDFViewer/Info.plist
+++ b/PDFViewer/Info.plist
@@ -4,6 +4,23 @@
 <dict>
 	<key>CFBundleDevelopmentRegion</key>
 	<string>de_DE</string>
+	<key>CFBundleDocumentTypes</key>
+	<array>
+		<dict>
+			<key>CFBundleTypeName</key>
+			<string>PDF</string>
+			<key>CFBundleTypeRole</key>
+			<string>Viewer</string>
+			<key>LSHandlerRank</key>
+			<string>Alternate</string>
+			<key>LSItemContentTypes</key>
+			<array>
+				<string>com.adobe.pdf</string>
+			</array>
+			<key>LSTypeIsPackage</key>
+			<integer>0</integer>
+		</dict>
+	</array>
 	<key>CFBundleExecutable</key>
 	<string>$(EXECUTABLE_NAME)</string>
 	<key>CFBundleIconFile</key>
@@ -17,13 +34,13 @@
 	<key>CFBundlePackageType</key>
 	<string>APPL</string>
 	<key>CFBundleShortVersionString</key>
-	<string>1.0</string>
+	<string>0.1</string>
 	<key>CFBundleSignature</key>
 	<string>????</string>
 	<key>CFBundleVersion</key>
-	<string>1</string>
+	<string>2</string>
 	<key>LSApplicationCategoryType</key>
-	<string>public.app-category.education</string>
+	<string>public.app-category.utilities</string>
 	<key>LSMinimumSystemVersion</key>
 	<string>$(MACOSX_DEPLOYMENT_TARGET)</string>
 	<key>NSHumanReadableCopyright</key>

--- a/PDFViewer/appdelegate/AppDelegate.h
+++ b/PDFViewer/appdelegate/AppDelegate.h
@@ -7,7 +7,11 @@
 //
 
 #import <Cocoa/Cocoa.h>
+#import "ViewController.h"
 
-@interface AppDelegate : NSObject <NSApplicationDelegate>
+@interface AppDelegate : NSObject <NSApplicationDelegate> {
+    NSWindow *window;
+    ViewController *controller;
+}
 
 @end

--- a/PDFViewer/appdelegate/AppDelegate.m
+++ b/PDFViewer/appdelegate/AppDelegate.m
@@ -8,14 +8,9 @@
 
 #import "AppDelegate.h"
 
-@interface AppDelegate ()
-
-@end
-
 @implementation AppDelegate
 
 - (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
-    // Insert code here to initialize your application
 }
 
 - (void)applicationWillTerminate:(NSNotification *)aNotification {
@@ -26,4 +21,35 @@
     return TRUE;
 }
 
+- (BOOL) application:(NSApplication *)sender openFile:(NSString *)filename {
+    window = [[[NSApplication sharedApplication] windows] objectAtIndex:0];
+    controller = (ViewController*) [window contentViewController];
+    
+    NSURL *url = [[NSURL alloc] initFileURLWithPath:filename];
+    BOOL status = [[controller pdfViewer] loadUrl: url];
+    
+    if (!status) {
+        [[controller pdfViewer] speak:(NSMutableString*)@"Das Dokument konnte nicht geladen werden"];
+    } else {
+        [[controller pdfViewer] startSpeaking:nil];
+    }
+    
+    return status;
+}
+
+- (void) application:(NSApplication *)sender openFiles:(NSArray<NSString *> *)filenames {
+    window = [[[NSApplication sharedApplication] windows] objectAtIndex:0];
+    controller = (ViewController*) [window contentViewController];
+    
+    NSString *filename = [filenames objectAtIndex:0];
+    NSURL *url = [[NSURL alloc] initFileURLWithPath:filename];
+    BOOL status = [[controller pdfViewer] loadUrl: url];
+    
+    if (!status) {
+        [[controller pdfViewer] speak:(NSMutableString*)@"Das Dokument konnte nicht geladen werden"];
+    } else {
+        [[controller pdfViewer] startSpeaking:nil];
+    }
+}
+
 @end

--- a/PDFViewer/pdfviewer/PDFViewer.h
+++ b/PDFViewer/pdfviewer/PDFViewer.h
@@ -24,4 +24,10 @@
 - (void)speak:(NSMutableString *)texts;
 - (void)silence;
 
+- (NSString*) getSalutation;
+- (BOOL) loadUrl: (NSURL*) url;
+
+- (void) showErrorMessage: (NSString*) message;
+- (void) showDebugMessage: (NSString*) message;
+
 @end

--- a/PDFViewer/pdfviewer/PDFViewer.m
+++ b/PDFViewer/pdfviewer/PDFViewer.m
@@ -20,7 +20,13 @@
     NSMutableString *strings = [[NSMutableString alloc] init];
     NSUInteger nOps = [[self document] pageCount];
     
-    [strings appendString:[NSString stringWithFormat:@"Genosse Parteisekretär, das Dokument hat %lu Seiten", nOps]];
+    NSString *salutation = [self getSalutation];
+    
+    if (nOps > 0) {
+        [strings appendString:[NSString stringWithFormat:@"%@, das Dokument hat %lu Seiten", salutation, nOps]];
+    } else {
+        [strings appendString:[NSString stringWithFormat:@"%@, laden Sie ein Dokument mit MAC-O", salutation]];
+    }
     
     for (int pages = 0; pages < nOps; pages++) {
         PDFPage *page = [[self document] pageAtIndex:pages];
@@ -45,9 +51,8 @@
             
             // neues PDF laden
             NSURL* url = [[panel URLs] objectAtIndex:0];
-            PDFDocument *doc = [[PDFDocument alloc] initWithURL:url];
+            [self loadUrl:url];
             
-            [self setDocument:doc];
             [self startSpeaking:nil];
         }
     }];
@@ -104,4 +109,44 @@
     return inputStr;
 }
 
+- (NSString*) getSalutation {
+    NSString *fullName = NSFullUserName();
+    NSArray<NSString*> *array = [fullName componentsSeparatedByString:@" "];
+
+    NSString *name = @"Parteisekretär";
+    
+    if (array != NULL) {
+        if ([array count] >= 1) {
+            name = [array objectAtIndex:1];
+        }
+    }
+    
+    NSString *salutation = [NSString stringWithFormat:@"Genosse %@", name];
+    
+    return salutation;
+}
+
+- (BOOL) loadUrl: (NSURL*) url {
+    PDFDocument *doc = [[PDFDocument alloc] initWithURL:url];
+    
+    [self silence];
+    [self setDocument:doc];
+    
+    return (doc != NULL);
+}
+
+- (void) showErrorMessage: (NSString*) message {
+    NSAlert *alert = [[NSAlert alloc] init];
+    [alert setMessageText:message];
+    [alert setInformativeText:@"Fehler"];
+    [alert runModal];
+}
+
+- (void) showDebugMessage: (NSString*) message {
+    NSAlert *alert = [[NSAlert alloc] init];
+    [alert setMessageText:message];
+    [alert setInformativeText:@"Debug"];
+    [alert runModal];
+}
+
 @end

--- a/PDFViewer/viewcontroller/ViewController.m
+++ b/PDFViewer/viewcontroller/ViewController.m
@@ -14,13 +14,6 @@
 
 - (void)viewDidLoad {
     [super viewDidLoad];
-    
-    NSString *str = @"https://derinistihbarat.files.wordpress.com/2012/08/die-doktorarbeit-von-stasi-koko-chef-alexander-schalck-golodtkowski.pdf";
-    
-    NSURL *url = [NSURL URLWithString:str];
-    
-    PDFDocument *doc = [[PDFDocument alloc] initWithURL:url];
-    [_pdfViewer setDocument:doc];
 }
 
 - (void)viewDidAppear {