Hi, imagex.exe is a standalone file, you can place it evrywhere but you have to map drive to the imagex.exe directory via UNC and choose the letter that you just map :
Example :
In provisioning you add a action to map drive, you choose a letter (T:/) and point to imagex.exe (\\landesk2\ldmain\osd\) directory, after you do the same to map drive to image file too.
Hope it will help you.
Ben