thetool/Layout/default/Workflow/items/file.php

<input type="text" class="form-control" name="wfitem_<?=$item->name?>" id="wfitem_<?=$item->name?>_<?=$$wftype->id?>" value="<?=$item->value->value_string?>" <?=($item->style) ? "style='".$item->style."'" : ""?>>