Visual Subst is a small tool which allows you to associate your most accessed directories with virtual drives. Simply choose the folder you want to turn in to a virtual drive and then assign a drive letter. You can then access the contents of your folder through ‘x:’. It uses the same API as the DOS-base 'subst' utility, but makes it easier to create and remove virtual drives through an easy-to-use user interface.

Creating a virtual drive isn’t just for users who want to allocate a drive letter to a folder path. You can use the function to setup a drive so that the contents of a folder are located within the root of your new drive. This makes it easy to test contents of a folder or, if you’re a CD builder, test the contents of your folder as if it was stored on a CD.

All local DOS-based virtual drive names are removed when the user logs off or switches of their computer. To handle this issue, Visual Subst saves the list of virtual drives into an INI-file and can load them the next time if required.