Mync requires QuickTime for Windows to browse/playback following clip:

Still Image File Formats: Flash Pix; JPEG2000; Mac Pict; QuickTime Image
MOV Video File Formats: 3GP; 3G2; M4V or some MOV file formats
Audio File Formats: MOV (other than Linear PCM and AAC); QuickTime Audio

If you need to use these functionality, please install QuickTime Essentials then change Mync settings as following:

1. Choose [Settings] > [General].

2. Check "Enable QuickTime Importer" option.

3. Close the settings dialog.

4. Restart Mync to apply changed settings.