Have problem locating plug-ins

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Looks to me like you are describing GIMP running on a Linux where there are NO drive letters rather than a Windows system.  However, your reference to miracle made me look for some magic of my own.  Therefore, I simply entered the path without the drive letter and LOW & BEHOLD it works.  To be clear in my case the the plugin is located in the same file system (i.e., partition and drive) as the GIMP software. In fact the first couple of directories in the path are the same as the GIMP software.

While this does leave me a little confused about how it works the idea that it does work is welcome.

Many thanks for the assistance.