Application.Run "BExAnalyzer.xla!runWorkbook", "7JKJM2XEH70HCSWDHEFB21RM5"
7JKJM2XEH70HCSWDHEFB21RM5 is the id of the workbook. In 3.5 the command is:
Application.Run "sapbex.xla!SAPBEXreadWorkbook", "7JKJM2XEH70HCSWDHEFB21RM5"
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Then you have to take a look into Analysis Office - The Comprehensive Guide.