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In order to try to reproduce a bug, I need to disable the generation of short path aliases in Windows (XP, Vista and 7). Where is this setting exactly?

MSDN - Long vs short path names

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You can use the fsutil program to disable 8.3 file name generation on NTFS partitions.

fsutil.exe behavior set disable8dot3 1

This is documented in the Microsoft Support article How to Disable the 8.3 Name Creation on NTFS Partitions

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