ERROR
The error "Could not open raster dataset from file" occurs when peforming certain functions using the Raster Calculator.
In ArcGIS 8.1, non-grid outputs from the Raster Calculator are not added directly to the Table of Contents in ArcMap. Examples of non-grid output include shapefiles (such as that generated from GridShape) and tables.
The non-grid output is stored in your working directory. As a workaround, navigate to the location of these outputs and add them to ArcMap using the Add Data button on the Standard toolbar.
Note:
Some output types cannot be added directly to ArcMap, such as the result from the GridAscii function.
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