The files are pair. One is a summary file, and the other is the data. ImgBurn actually uses both to burn the CD-R, but you only need to select one of them from ImgBurn's file open menu.

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2000 E38 750iL Highline Edition, Upgraded with the lastest 2006 X5 Electronics
MKIV Navigation, 16:9 Display, Bluetooth, TV/Video with Backup Camera, Sirius, and Aux Input