Documents Previewer will automatically preview the file when you select a document. And the file will automatically be categorized into ten preset file categories when previewed. You can preview them forward or backward quickly via selecting the file category and click forward and backward button.  

Picture Previewer Supports Zoom in, Zoom out, Wheel Zoom, Drag move, Fit to width, Show All and Preview Panel.

Audio and Video Previewer  supports Replay  start and end setting, repeat, Full Screen, Play Speed etc.

Documents Previewer can preview Microsoft Office Word, Excel, PPT and Adobe PDF.

Documents Previewer can preview CHM, RTF, TXT, SWF, GIF, HTM, and HMT etc. file types.

Documents Previewer can preview VMC multimedia library directly and enjoy all the features in VMC such as watch YouTube vide, play music or movies etc.

With Music Mate you can display, create and export full size artworks cover and sync lyrics display while listening to the music, it is much better than Windows Media Player and Apple iTunes. 
Music Mate supports sync lyrics display and can create and export lyrics for most popular music such as mp3, flac, m4a etc. 
And more, Music mate lets you attach gif animation artworks to most popular music and sync display animate and lyrics while playing the music. Music Mate automatically sync the lyrics and play progress bar. So when you adjust the play progress bar, the lyrics will be adjusted automatically. If you double click the lyrics, the play progress bar will be automatically adjusted. 
Because lyrics and artworks are integrated into the music file, you don't have to keep the separate lyrics file any more! 
You have 3 display mode including artworks cover only, lyrics only, artworks and lyrics. You have 4 positions options to display artworks and lyrics to vertical, horizontal and flip. You can switch all these display mode via the previewer top right three buttons. 
And more, you can set the reread start position and reread stop position to reread the music with ease, too.