diff --git a/src/aphront/multipartparser/AphrontMultipartPart.php b/src/aphront/multipartparser/AphrontMultipartPart.php
index 28daa28..04e79e9 100644
--- a/src/aphront/multipartparser/AphrontMultipartPart.php
+++ b/src/aphront/multipartparser/AphrontMultipartPart.php
@@ -1,66 +1,96 @@
 <?php
 
 final class AphrontMultipartPart extends Phobject {
 
   private $headers = array();
   private $value = '';
 
   private $name;
   private $filename;
+  private $tempFile;
+  private $byteSize = 0;
 
   public function appendRawHeader($bytes) {
     $parser = id(new AphrontHTTPHeaderParser())
       ->parseRawHeader($bytes);
 
     $header_name = $parser->getHeaderName();
 
     $this->headers[] = array(
       $header_name,
       $parser->getHeaderContent(),
     );
 
     if (strtolower($header_name) === 'content-disposition') {
       $pairs = $parser->getHeaderContentAsPairs();
       foreach ($pairs as $pair) {
         list($key, $value) = $pair;
         switch ($key) {
           case 'filename':
             $this->filename = $value;
             break;
           case 'name':
             $this->name = $value;
             break;
         }
       }
     }
 
     return $this;
   }
 
   public function appendData($bytes) {
+    $this->byteSize += strlen($bytes);
+
     if ($this->isVariable()) {
       $this->value .= $bytes;
     } else {
-      throw new Exception(pht('File multipart stuff is not yet supported.'));
+      if (!$this->tempFile) {
+        $this->tempFile = new TempFile(getmypid().'.upload');
+      }
+      Filesystem::appendFile($this->tempFile, $bytes);
     }
 
     return $this;
   }
 
   public function isVariable() {
     return ($this->filename === null);
   }
 
   public function getName() {
     return $this->name;
   }
 
   public function getVariableValue() {
     if (!$this->isVariable()) {
       throw new Exception(pht('This part is not a variable!'));
     }
 
     return $this->value;
   }
 
+  public function getPHPFileDictionary() {
+    if (!$this->tempFile) {
+      $this->appendData('');
+    }
+
+    $mime_type = 'application/octet-stream';
+    foreach ($this->headers as $header) {
+      list($name, $value) = $header;
+      if (strtolower($name) == 'content-type') {
+        $mime_type = $value;
+        break;
+      }
+    }
+
+    return array(
+      'name' => $this->filename,
+      'type' => $mime_type,
+      'tmp_name' => (string)$this->tempFile,
+      'error' => 0,
+      'size' => $this->byteSize,
+    );
+  }
+
 }