Index a Digital Line Graph (DLG) file to improve performance. The DLG format supported in MicroCAM for Windows consists of line segments with no structure. Indexing the DLG file creates a metadata index that allows MCW to efficiently determine whether a specific line segment is to be used in the map. The index files are stored in the Data directory allowing DLG CDROMs to be indexed, greatly enhancing their performance. MCW checks for the presence of an index whenever a DLG file is accessed and uses the index, if found.
More information on the DLG files and the mounting procedure can be found under Digital Line Graph Database File Format.