diff --git a/src/WMF/Reader/ReaderInterface.php b/src/WMF/Reader/ReaderInterface.php
index ee057c7..3c07bfd 100644
--- a/src/WMF/Reader/ReaderInterface.php
+++ b/src/WMF/Reader/ReaderInterface.php
@@ -7,12 +7,12 @@
 
 interface ReaderInterface
 {
-    public function isWMF(string $filename): bool;
-
     public function load(string $filename): bool;
 
     public function save(string $filename, string $format): bool;
 
+    public function getMediaType(): string;
+
     /**
      * @phpstan-ignore-next-line
      *
diff --git a/src/WMF/Reader/GD.php b/src/WMF/Reader/WMF/GD.php
similarity index 93%
rename from src/WMF/Reader/GD.php
rename to src/WMF/Reader/WMF/GD.php
index 82af6af..65d65f2 100644
--- a/src/WMF/Reader/GD.php
+++ b/src/WMF/Reader/WMF/GD.php
@@ -2,7 +2,7 @@
 
 declare(strict_types=1);
 
-namespace PhpOffice\WMF\Reader;
+namespace PhpOffice\WMF\Reader\WMF;
 
 use GdImage;
 use PhpOffice\WMF\Exception\WMFException;
@@ -72,6 +72,9 @@ public function isWMF(string $filename): bool
         return $key == (int) 0x9AC6CDD7;
     }
 
+    /**
+     * @see https://github.com/affinitybridge/mpdf/blob/master/src/Image/Wmf.php
+     */
     public function load(string $filename): bool
     {
         $this->content = file_get_contents($filename);
@@ -252,13 +255,31 @@ public function load(string $filename): bool
                     }
                     break;
                 default:
-                    // throw new WMFException('Reader : Function not implemented : 0x' . str_pad(dechex($recordType), 4, '0', STR_PAD_LEFT));
+                    throw new WMFException('Reader : Function not implemented : 0x' . str_pad(dechex($recordType), 4, '0', STR_PAD_LEFT));
             }
         }
 
         return true;
     }
 
+    protected function readHeader(): void
+    {
+        list(, $key) = unpack('L', substr($this->content, 0, 4));
+        list(, $handle) = unpack('S', substr($this->content, 4, 2));
+        list(, $left) = unpack('S', substr($this->content, 6, 2));
+        list(, $top) = unpack('S', substr($this->content, 8, 2));
+        list(, $right) = unpack('S', substr($this->content, 10, 2));
+        list(, $bottom) = unpack('S', substr($this->content, 12, 2));
+        list(, $this->unitPerInch) = unpack('S', substr($this->content, 14, 2));
+        list(, $reserved) = unpack('L', substr($this->content, 16, 4));
+        list(, $checksum) = unpack('S', substr($this->content, 18, 2));
+
+        $this->pos = 18;
+        if ($key == (int) 0x9AC6CDD7) {
+            $this->pos += 22;
+        }
+    }
+
     /**
      * @return array<int, int>
      */
@@ -280,19 +301,21 @@ protected function resetCoordinates(int $x, int $y): array
     /**
      * @param array<string, string> $gdiObject
      */
-    protected function addGDIObject(array $gdiObject): void
+    protected function addGDIObject(array $gdiObject, ?int $idx = null): void
     {
-        // Find next available slot
-        $idx = 0;
-
-        if (!empty($this->gdiObjects)) {
-            $empty = false;
-            $i = 0;
-            while (!$empty) {
-                $empty = !isset($this->gdiObjects[$i]);
-                ++$i;
+        if (!$idx) {
+            // Find next available slot
+            $idx = 0;
+
+            if (!empty($this->gdiObjects)) {
+                $empty = false;
+                $i = 0;
+                while (!$empty) {
+                    $empty = !isset($this->gdiObjects[$i]);
+                    ++$i;
+                }
+                $idx = $i - 1;
             }
-            $idx = $i - 1;
         }
 
         $this->gdiObjects[$idx] = $gdiObject;
@@ -301,7 +324,7 @@ protected function addGDIObject(array $gdiObject): void
     /**
      * @phpstan-ignore-next-line
      *
-     * @return GDImage|resource
+     * @return GdImage|resource
      */
     public function getResource()
     {
@@ -337,21 +360,8 @@ public function save(string $filename, string $format): bool
         }
     }
 
-    protected function readHeader(): void
+    public function getMediaType(): string
     {
-        list(, $key) = unpack('L', substr($this->content, 0, 4));
-        list(, $handle) = unpack('S', substr($this->content, 4, 2));
-        list(, $left) = unpack('S', substr($this->content, 6, 2));
-        list(, $top) = unpack('S', substr($this->content, 8, 2));
-        list(, $right) = unpack('S', substr($this->content, 10, 2));
-        list(, $bottom) = unpack('S', substr($this->content, 12, 2));
-        list(, $this->unitPerInch) = unpack('S', substr($this->content, 14, 2));
-        list(, $reserved) = unpack('L', substr($this->content, 16, 4));
-        list(, $checksum) = unpack('S', substr($this->content, 18, 2));
-
-        $this->pos = 18;
-        if ($key == (int) 0x9AC6CDD7) {
-            $this->pos += 22;
-        }
+        return 'image/wmf';
     }
 }
diff --git a/src/WMF/Reader/Imagick.php b/src/WMF/Reader/WMF/Imagick.php
similarity index 72%
rename from src/WMF/Reader/Imagick.php
rename to src/WMF/Reader/WMF/Imagick.php
index 34200d0..aa8969b 100644
--- a/src/WMF/Reader/Imagick.php
+++ b/src/WMF/Reader/WMF/Imagick.php
@@ -2,9 +2,10 @@
 
 declare(strict_types=1);
 
-namespace PhpOffice\WMF\Reader;
+namespace PhpOffice\WMF\Reader\WMF;
 
 use Imagick as ImagickBase;
+use ImagickException;
 use PhpOffice\WMF\Exception\WMFException;
 
 class Imagick implements ReaderInterface
@@ -16,9 +17,15 @@ class Imagick implements ReaderInterface
 
     public function load(string $filename): bool
     {
-        $this->im = new ImagickBase();
+        try {
+            $this->im = new ImagickBase();
 
-        return $this->im->readImage($filename);
+            return $this->im->readImage($filename);
+        } catch (ImagickException $e) {
+            $this->im->clear();
+
+            throw new WMFException('Cannot load WMG File from Imagick');
+        }
     }
 
     public function isWMF(string $filename): bool
@@ -34,6 +41,11 @@ public function getResource(): ImagickBase
         return $this->im;
     }
 
+    public function getMediaType(): string
+    {
+        return 'image/wmf';
+    }
+
     public function save(string $filename, string $format): bool
     {
         switch (strtolower($format)) {
diff --git a/src/WMF/Reader/Magic.php b/src/WMF/Reader/WMF/Magic.php
similarity index 84%
rename from src/WMF/Reader/Magic.php
rename to src/WMF/Reader/WMF/Magic.php
index ca83a6b..a33dc42 100644
--- a/src/WMF/Reader/Magic.php
+++ b/src/WMF/Reader/WMF/Magic.php
@@ -2,11 +2,11 @@
 
 declare(strict_types=1);
 
-namespace PhpOffice\WMF\Reader;
+namespace PhpOffice\WMF\Reader\WMF;
 
 use GDImage;
 use Imagick as ImagickBase;
-use PhpOffice\WMF\Reader\Imagick as ImagickReader;
+use PhpOffice\WMF\Reader\WMF\Imagick as ImagickReader;
 
 class Magic implements ReaderInterface
 {
@@ -37,6 +37,11 @@ public function save(string $filename, string $format): bool
         return $this->reader->save($filename, $format);
     }
 
+    public function getMediaType(): string
+    {
+        return $this->reader->getMediaType();
+    }
+
     public function isWMF(string $filename): bool
     {
         return $this->reader->isWMF($filename);
diff --git a/src/WMF/Reader/WMF/ReaderInterface.php b/src/WMF/Reader/WMF/ReaderInterface.php
new file mode 100644
index 0000000..84ace5f
--- /dev/null
+++ b/src/WMF/Reader/WMF/ReaderInterface.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace PhpOffice\WMF\Reader\WMF;
+
+use PhpOffice\WMF\Reader\ReaderInterface as ReaderInterfaceBase;
+
+interface ReaderInterface extends ReaderInterfaceBase
+{
+    public function isWMF(string $filename): bool;
+}
diff --git a/tests/WMF/Reader/AbstractTestReader.php b/tests/WMF/Reader/AbstractTestReader.php
index 0c46578..09cf0d6 100644
--- a/tests/WMF/Reader/AbstractTestReader.php
+++ b/tests/WMF/Reader/AbstractTestReader.php
@@ -26,7 +26,7 @@ public function assertImageCompare(string $expectedFile, string $outputFile, flo
     /**
      * @return array<array<string>>
      */
-    public static function dataProviderFiles(): array
+    public static function dataProviderFilesWMF(): array
     {
         return [
             [
@@ -43,4 +43,16 @@ public static function dataProviderFiles(): array
             ],
         ];
     }
+
+    /**
+     * @return array<array<string>>
+     */
+    public static function dataProviderFilesWMFNotImplemented(): array
+    {
+        return [
+            [
+                'test_libuemf.wmf',
+            ],
+        ];
+    }
 }
diff --git a/tests/WMF/Reader/GDTest.php b/tests/WMF/Reader/WMF/GDTest.php
similarity index 69%
rename from tests/WMF/Reader/GDTest.php
rename to tests/WMF/Reader/WMF/GDTest.php
index 759cb1b..a29536b 100644
--- a/tests/WMF/Reader/GDTest.php
+++ b/tests/WMF/Reader/WMF/GDTest.php
@@ -2,15 +2,17 @@
 
 declare(strict_types=1);
 
-namespace Tests\PhpOffice\WMF\Reader;
+namespace Tests\PhpOffice\WMF\Reader\WMF;
 
 use GdImage;
-use PhpOffice\WMF\Reader\GD;
+use PhpOffice\WMF\Exception\WMFException;
+use PhpOffice\WMF\Reader\WMF\GD;
+use Tests\PhpOffice\WMF\Reader\AbstractTestReader;
 
 class GDTest extends AbstractTestReader
 {
     /**
-     * @dataProvider dataProviderFiles
+     * @dataProvider dataProviderFilesWMF
      */
     public function testLoad(string $file): void
     {
@@ -19,7 +21,7 @@ public function testLoad(string $file): void
     }
 
     /**
-     * @dataProvider dataProviderFiles
+     * @dataProvider dataProviderFilesWMF
      */
     public function testGetResource(string $file): void
     {
@@ -34,7 +36,7 @@ public function testGetResource(string $file): void
     }
 
     /**
-     * @dataProvider dataProviderFiles
+     * @dataProvider dataProviderFilesWMF
      */
     public function testOutput(string $file): void
     {
@@ -51,11 +53,22 @@ public function testOutput(string $file): void
     }
 
     /**
-     * @dataProvider dataProviderFiles
+     * @dataProvider dataProviderFilesWMF
      */
     public function testIsWMF(string $file): void
     {
         $reader = new GD();
         $this->assertTrue($reader->isWMF($this->getResourceDir() . $file));
     }
+
+    /**
+     * @dataProvider dataProviderFilesWMFNotImplemented
+     */
+    public function testNotImplemented(string $file): void
+    {
+        $this->expectException(WMFException::class);
+
+        $reader = new GD();
+        $reader->load($this->getResourceDir() . $file);
+    }
 }
diff --git a/tests/WMF/Reader/ImagickTest.php b/tests/WMF/Reader/WMF/ImagickTest.php
similarity index 66%
rename from tests/WMF/Reader/ImagickTest.php
rename to tests/WMF/Reader/WMF/ImagickTest.php
index a8076f2..e5d52fd 100644
--- a/tests/WMF/Reader/ImagickTest.php
+++ b/tests/WMF/Reader/WMF/ImagickTest.php
@@ -2,15 +2,17 @@
 
 declare(strict_types=1);
 
-namespace Tests\PhpOffice\WMF\Reader;
+namespace Tests\PhpOffice\WMF\Reader\WMF;
 
 use Imagick as ImagickBase;
-use PhpOffice\WMF\Reader\Imagick as ImagickReader;
+use PhpOffice\WMF\Exception\WMFException;
+use PhpOffice\WMF\Reader\WMF\Imagick as ImagickReader;
+use Tests\PhpOffice\WMF\Reader\AbstractTestReader;
 
 class ImagickTest extends AbstractTestReader
 {
     /**
-     * @dataProvider dataProviderFiles
+     * @dataProvider dataProviderFilesWMF
      */
     public function testLoad(string $file): void
     {
@@ -19,7 +21,7 @@ public function testLoad(string $file): void
     }
 
     /**
-     * @dataProvider dataProviderFiles
+     * @dataProvider dataProviderFilesWMF
      */
     public function testGetResource(string $file): void
     {
@@ -29,7 +31,7 @@ public function testGetResource(string $file): void
     }
 
     /**
-     * @dataProvider dataProviderFiles
+     * @dataProvider dataProviderFilesWMF
      */
     public function testOutput(string $file): void
     {
@@ -46,11 +48,22 @@ public function testOutput(string $file): void
     }
 
     /**
-     * @dataProvider dataProviderFiles
+     * @dataProvider dataProviderFilesWMF
      */
     public function testIsWMF(string $file): void
     {
         $reader = new ImagickReader();
         $this->assertTrue($reader->isWMF($this->getResourceDir() . $file));
     }
+
+    /**
+     * @dataProvider dataProviderFilesWMFNotImplemented
+     */
+    public function testNotImplemented(string $file): void
+    {
+        $this->expectException(WMFException::class);
+
+        $reader = new ImagickReader();
+        $reader->load($this->getResourceDir() . $file);
+    }
 }
diff --git a/tests/WMF/Reader/MagicTest.php b/tests/WMF/Reader/WMF/MagicTest.php
similarity index 80%
rename from tests/WMF/Reader/MagicTest.php
rename to tests/WMF/Reader/WMF/MagicTest.php
index 831ea14..5bfa59b 100644
--- a/tests/WMF/Reader/MagicTest.php
+++ b/tests/WMF/Reader/WMF/MagicTest.php
@@ -2,14 +2,15 @@
 
 declare(strict_types=1);
 
-namespace Tests\PhpOffice\WMF\Reader;
+namespace Tests\PhpOffice\WMF\Reader\WMF;
 
-use PhpOffice\WMF\Reader\Magic;
+use PhpOffice\WMF\Reader\WMF\Magic;
+use Tests\PhpOffice\WMF\Reader\AbstractTestReader;
 
 class MagicTest extends AbstractTestReader
 {
     /**
-     * @dataProvider dataProviderFiles
+     * @dataProvider dataProviderFilesWMF
      */
     public function testLoad(string $file): void
     {
@@ -18,7 +19,7 @@ public function testLoad(string $file): void
     }
 
     /**
-     * @dataProvider dataProviderFiles
+     * @dataProvider dataProviderFilesWMF
      */
     public function testGetResource(string $file): void
     {
@@ -28,7 +29,7 @@ public function testGetResource(string $file): void
     }
 
     /**
-     * @dataProvider dataProviderFiles
+     * @dataProvider dataProviderFilesWMF
      */
     public function testOutput(string $file): void
     {
@@ -45,7 +46,7 @@ public function testOutput(string $file): void
     }
 
     /**
-     * @dataProvider dataProviderFiles
+     * @dataProvider dataProviderFilesWMF
      */
     public function testIsWMF(string $file): void
     {
diff --git a/tests/resources/test_libuemf.png b/tests/resources/test_libuemf.png
new file mode 100644
index 0000000..a8cefc6
Binary files /dev/null and b/tests/resources/test_libuemf.png differ
diff --git a/tests/resources/test_libuemf.wmf b/tests/resources/test_libuemf.wmf
new file mode 100644
index 0000000..bdf06a9
Binary files /dev/null and b/tests/resources/test_libuemf.wmf differ