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Fixit 18. Check for Problems with Extens... > Is the Startup Extension in Its Prop...

Is the Startup Extension in Its Proper Location in the System Folder?

Remember, startup extensions load only if they are in one of the following locations: the Extensions folder, the Control Panels folder, and the root level of the System Folder (that is, not in any subfolder). Some startup extensions work properly only if they are in one, but not either of the other, of these locations.

Normally, to add a new startup extension to the System Folder, either use the startup extension's Installer utility or drag the startup extension file to the System Folder icon (not the System file icon and not the System Folder window). In the latter case, the Finder determines the startup extension's correct folder (Extensions or Control Panels) and asks you if you want it to be placed there. If you add startup extensions by any other method, you may inadvertently place them in a wrong location. In such cases, they may either not work properly or not load at all. However, I must admit that this automatic method sometimes makes mistakes itself. For example, ordinary applications designed to look like control panels and go in the Controls Panel folder will be placed in the root level of the System Folder instead. Recent versions of the Mac OS make less of these mistakes, especially if developers follow guidelines for how the file types of these control panels should be assigned).


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