At present the files are found using the base path name and the UA_CPU attribute sent by the client. The new path is oldPath.cpuType.
Eg: Input: /winnt/ie.cab Output: /winnt/ie.cab.x86 when UA_CPU = x86 Output: /winnt/ie.cab.alpha when UA_CPU = alpha Output: /winnt/ie.cab.mips when UA_CPU = mips Output: /winnt/ie.cab.ppc when UA_CPU = ppc
If you really want to get the real files for all platforms try
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