<div class="container-fluid">
<h1>input type="file"</h1>
<form class="form-horizontal well">
<div class="control-group">
<label class="control-label" for="id_images">accept images (jpg, gif, png, bmp):</label>
<div class="controls">
<input type="file" class="input-xlarge" id="id_images" name="images" accept="image/jpg,image/jpeg,image/gif,image/png,image/bmp">
</div>
</div>
<div class="control-group">
<label class="control-label" for="id_text">accept text formats (pdf, zip, txt, doc):</label>
<div class="controls">
<input type="file" class="input-xlarge" id="id_text" name="text" accept="application/pdf,application/zip,text/plain,application/msword,
application/vnd.openxmlformats-officedocument.wordprocessingml.document">
</div>
</div>
</form>
</div>
External resources loaded into this fiddle: