PCManFM is the default file & desktop manager for Lubuntu. It's a simple and fast file manager, but its simplicity is now enhanced by providing us the unlimited power of customized actions, like other file managers (Nautilus, Thunar, etc). For that purpose I made another Trips and Tricks section, called Actions.
This feature (available on recent versions of PCManFM and Lubuntu 14.04) will allow you to do virtually everything, like converting MP3 to OGG, MP4 to AVI, compress a JPEG, reduce a PDF size, send a file via bluetooth, etc. For now only a couple of actions are included for now. If you made nice actions, please share with us and the entire world sending them. I'll add them to the list, and we hope it gets bigger and more complete. Share!