Run Crystal Reporting Viewer by double-clicking any of the Crystal Reports (CREST).5. Crystal Reports for Windows and Mac are fully compatible with SAP R Server and CREST; and can run on any UNIX, Linux, and Windows operating system. For a detailed list of CREST modules on SAP's website, please visit this page: (please read SAP R Server FAQ before asking a question). To start Crystal Reporter, open Crystal Reports Viewer by double-clicking the CREST file. CREST is a standard XML format. To view the information in CREST, either open the CREST file in Crystal Reports Viewer (right-click the CrystleRpt.xml file and choose View in Crystal). Open a CREST file in RPT-Viewer. In Crystal Reports Viewer, you can view CREST-formatted data as a table or matrix. Double-click the CREST file to use Crystal Reports Viewer to open the CREST file in RPT-Viewer. Open a CREST file and open Data_Units_CREST.RPT (or Excel_Units_CREST.xlsx) in Crystal Reports Viewer. To open CREST files, you must choose the right viewing mode for a format in the CREST file. For example, Crystal Reports Viewer uses the default mode to show the matrix, as well as the Table mode to show rows and columns in the data in the CREST file. The table file can have only one sub-table. In both crystal files, choose Table mode in both CREST files. Select “XLS” to open the CREST file in a XLS document. Crystal Report for Excel works similarly to Crystal Reports Viewer, but can include the matrix data in the CREST file. How to use Crystal Reports for Excel (CREST) — window If you need to open a CREST file more than once, double-click the CREST file to open two separate windows to view the same CREST with two different formats, one for each data format. The first data window in a two-window CREST file is a .data.