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After extracting a Microsoft security patch, I got several folders containing the updated DLL. For Windows XP SP3 I have two folders: SP3GDR and SPQFE. Does anyone know what is the difference between those two folders? also what does 'GDR' and 'QFE' mean?

The two DLLs have a different MD5 signature.

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GDR stands for General Distribution Release.
QFE stands for Quick Fix Engineering.

See this.

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