Bentley Map does not support the ArcMap Document .mxd format. Bentley Map does directly support ESRI Shapefile and the File Geodatabase. MXD can be imported using the FME tools if you are a licensed user of the FME Desktop products, as seen in the Bentley…

Oto, MXD or LYR cannot be imported in Bentley Map. Only geometries are supported from Esri. Best Regards, Sebastien Lefrancois [Bentley]

If you have ESRI ArcGIS installed on the same machine, it may be attempting to verify that it can successfully obtain a license for the MXD Reference Attach functionality (available in Raster Manager when ArcGIS 8.x client available). If that may be the…