User wants to be able to use an Environment Variable so when someone attaches a raster image that it will not matter if the user is using a different share drive letter than the user who attached the raster image to the DGN file. When the user attaches the raster image they want to use the Environment Variable as the folder path, which will show the UNC path instead of the folder path.
In raster manager if you right click on the raster image name you will see the environment variable path name and the raster image name.You must define the Configuration Variable name on all of your workstations. If you use both MicroStation and Descartes or you use multiple custom workspaces then you will need to define the Environment Variable in both MicroStation and Descartes and all of your custom workspaces. The environment variable will only be valid in the workspaces that you define the Environment Variable.
Use An Environment Variable to Define UNC Path For Raster Image Attachment