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Chris: Elite has a header. However, it has been the subject of a lot of patching, and as a result the header is now inconsistent with the actual file, so the version on the AcornArcade site won't load. This is an oversight from when it was patched - the solution of course is to correct the header (since Elite without the patches definitely won't work!) In a way, this is a prime example of one of many benefits of the AIF checks - it spotted a 'tampered' file and wouldn't let it run. The fact that the 'tampering' in this case is deliberate and beneficial is a side issue. I got Elite running once under Aemulor, but since have had troubles with its sound modules not loading - solutions welcome!

The case for AIF headers really doesn't revolve around this (it's more a useful side-effect) however: if a rogue application (eg a virus,) appends data but doesn't modify the header, the application won't run - effectively preventing spread. RISC OS viruses that aren't 32-bit (can't imagine any 32-bit ones!) running under Aemulor or on RISC PCs that try to infect absolute files will no longer be able to spread (because they won't modify the header - you wouldn't be able to load any infected apps!). When filtering viruses, any new 'Select 4 compliant' viruses would also have distinctive behaviour patterns (they have to modify the data AND the AIF header,) which should also make them easier to spot and scrutinise.

As the number of 'known' new RISC OS viruses is precisely none, this is in many ways a moot point (although obsoleting a few old viruses is no bad thing!) However, hopefully a point of interest!

 is a RISC OS Usermd0u80c9 on 2/7/06 4:25PM
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