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Monday, November 07, 2005

DLL search order during loading

On Windows, LoadLibrary has most affinity for the directory from where application was loaded. Thus, if you have foo.dll in the %windir%/system32 folder and another copy in the same directory as your application, when foo.dll is referenced from that application, the version co-located with the application is always loaded.

This MSDN article talks in more detail about DLL search order.

For managed code dependencies, the Global Assembly Cache always prevails; the local assembly in application directory will not be picked up if there is an existing (or newer with policy) copy in the GAC.

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