Producer can store any file format whether it understands it or not. It also tries to display thumbnail previews. Note that it is always possible to upload a preview image manually for any file.
2D Pixmap Images
Here is a non-exclusive list of files for which Producer will be able to generate a thumbnail: .bmp, .gif, .jpg, .jpeg, .jp2, .pdf, .png, .psd, .sgi, .tga, .tif, .tiff.
Producer can playback, and even preview at thumbnail size, .mp4 videos. Other formats, such as .swf files, will simply be stored.
The sound file format is not an issue as Producer will not attempt to playback sound files. There is no problem storing any audio format: .wav, .aiff, .asf, .mp3, and so on.
For now, these files can only be stored. You can upload a preview image from them.