InputStream ins = getResources().openRawResource(R.raw.aa);
int size;
try {
         size = ins.available();
         byte[] buffer = new byte[size];     
         ins.read(buffer);
         ins.close();
 
         File file = new File("data/data/com.CallAppnResult/aaaa.ppt");    
         OutputStream ous = new FileOutputStream(file);
         ous.write(buffer);
         ous.close();
   
 } catch (IOException e) {
         e.printStackTrace();
}

intent.setAction(Intent.ACTION_VIEW);
Uri uri = Uri.parse("file:///data/data/com.CallAppnResult/aaaa.ppt");
intent.setDataAndType(uri, "application/vnd.ms-powerpoint");
startActivity(intent);