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AccdbMerge (mirror), version 1.14.4, 1.2 MB.

Microsoft Access Database Engine 2010 Redistributable (link goes to Microsoft), may be necessary to fix data diff/merge issues. See Why I might need AccessDatabaseEngine? and Known Issues for details. Microsoft Download Center suggests two files for this download - AccessDatabaseEngine.exe and AccessDatabaseEngine_x64.exe - first one should be used, not x64 version.