I AM NOT SURE IF THERE IS AN OS THAT CAN COLLECT INFO AND FABRICATE FILES AS YOU SAID, BUT ITS NOT HARD TO BELIEVE OR EVEN DEVELOPE. BUT IT'S DISTURBING TO THINK ABOUT NON THE LESS. I HAVE DOWNLOADED A FEW (DMG) APPS THAT HAD TO HAVE BEEN DEVELOPED BY APPLE. HOW DO I KNOW?

EX: FILE LOADS IMAGE/INSTALLER IS LAUNCHED/ OS EXAMINES PACKAGE/ RELEASE+LICENCSE IS PRESENTED/DOWNLOAD BEGINS/OPTIMIZATION BEGINS/ INSTALL COMPLETE/RESTART.
CRASHED!!!!!!!!!!! I HAVE TO BOOT IN UNIX AND RUN ROOT, ONLY TO DISCOVER THAT FOLDERS IN THE SYSTEM LIBRARY FOLDER ARE DELETED. THIS IS NO DOUBT APPLE. AS A TECH, I CAN ASSURE ANYONE THAT THIS TYPE OF FABRICATION HAS TO BE VERY WELL FUNDED,EXTREMELY DIFFICULT, AND REQUIRE A HIGH LEVEL OF KNOWLDEGE IN DEVELOPMENT. BESIDES, WHO WITH EVEN LOW END KNOWLEDGE OF DEVELOPEMENT CAN DENY THAT APPLE IS ENTIRELY RESPONSIBLE FOR THE PC VIRUS CRISIS? SINCE APPLES ARE UNIX BASED NOW, THEY CAN CARRY,BUT NOT HOST VIRUSES. SO THE ONLY WAY TO AFFECT MAC IS TO EDIT THE SYSTEM FOLDERS BECAUSE OF THE NATURE OF ITS PC SIMILAR FILE ALLOCATION. SOMETIMES DMG'S WILL FAIL TO PRODUCE AN IMAGE AT ALL WHICH IS CONVENIANT, BUT IS DISCOURAGING BECAUSE OF THE TIME IT TAKES TO DOWNLOAD. I HAVE HAD AN OVERALL GOOD EXPERIENCE WITH DMG'S. 2 TO 3 OUT OF 10 ARE ACTUALLY BAD. BUT THE SUREIST WAY TO GO IS SITX AND SIT FILES. IF THE PACKAGE IS OVERLY LARGE, IT NO DOUBT CONTAINS A DMG INSIDE WHICH IS AUTOMATICALLY SUSPECT. THE BEST WAY TO TELL IS TO GET THE SIZE SPECS FROM THE DEVELOPERS WEBSITE. THE SITX OR SIT SHOULD BE ABOUT 5 TO 10 MEGS PER 100 SMALLER THAN THE ORIGINAL. A GREAT WAY TO TELL! KEEP ME POSTED WITH MORE INFO. TAKE CARE FRIEND.