A simple file management app is called iPowerBank on iTunes. Browse files, while providing file management functions File Mgr: supports various files for importing and file browsing, playback, including file types: Photo: JPG, PNG, GIF file; Video: Support AVI, RMVB, FLV, MOV, MP4, M4V, WMV, MKV and other video formats; Audio: support various types of music,
Document: support PDF, TXT, RTF, HTML, Doc, PPT, xls, and other formats;
File Mgmt: Powerful file manager utility, create folder for files management, support file sorting function. Shows storage & memory capacity.