Extend is a utility app that runs in the background and automatically rename any picture saved on the device without extension.
Sometimes pictures are downloaded to the device without the extension and so stays hidden on the picture app. You can see the files o the File Manager, but still gets unable to open.
Thanks to CellNinja developer, those issues are over with Extend for BlackBerry 10. The app will fix the missing extension by renaming the file with a proper image extension. The app suporta JPG, TIFF, PNG, BMP, ICO and GIF.
Extend is available for FREE at BlackBerry World.