Sony announced Thursday that the new iteration of its Reader digital book will be able to read electronic books published in the .epub file format, a file type gaining acceptance among major trade book publishers, many of whom have committed to begin publishing forthcoming e-books in the format. Beginning in August, the new PRS-505 Reader model will support .epub files as well as Adobe eBooks with digital rights management technology and have the capability to reflow standard text-based Portable Document Format e-books, the company said.