Hello Yoko, The file path mentioned in the message you received (C:\Program Files (x86)\Bentley\WaterGEMS\WaterGEMS.exe) is the 32-bit version. This can be confirmed by looking at the Welcome dialog that generally opens when you first open the program. In the lower left of the Welcome dialog it will list the version number and if it is 32-bit or 64-bit. If the Welcome dialog doesn't open, you can go to Help > About WaterGEMS. In the lower left of this dialog, you will also see the version number and if it is 32-bit or 64-bit. More information on the message you reference can be found at the following link: http://communities.bentley.com/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/9388.modelbuilder-error-microsoft-access-database-engine-2010-64-bit-is-required-to-access-this-data-source Regards, Scott
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