Blue Book (CD standard) file system may also be included for compatibility with Mac OS computers. The mandatory files and directories include an autorun.inf file compatible with the Windows 95 AutoRun feature; a CDPLUS and a PICTURES directories; and an optional DATA directory. The term "enhanced CD" is also an umbrella term and a certification mark used to refer to different CD formats that support audio and data content, including mixed mode CDs, CD-i and CD-i Ready. Blue Book (CD standard) The Blue Book is a compact disc standard developed in 1995 by Philips and Sony. It defines the Enhanced Music CD format (E-CD,
Philips Records the Philips Recording Center in Baarn, Netherlands, and formed Polyhymnia International (a recording and mastering company) and Pentatone Records (which specializes in SACD releases). Many of the Philips classical recordings have been reissued on the Eloquence label. Universal also released a "Philips 50" series marking the 50th anniversary of Philips Records in the early 2000s; some of those CDs are still in print. Pentatone has released Philips Quadraphonic sound recordings from the early and mid-1970s in 4-channel SACD format, as their RQR Series. Philips' classical catalog was issued on CD under the headings "Digital Classics", "Legendary Classics" and "Silver Line