PlayTime calculates the total play time of a list of most any music or movie file. It has a drag and drop interface, it can export all or selected rows to CSV file. It supports shell extension option and the total time is calculated as you add or remove files from the list.
What's new in this version:
Version 1.3.7 has added feature to move non-contiguous listview selections with the Ctrl+Up and Ctrl+Down hotkeys.