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The steps below will help to register the DAO360.dll file. This is sometimes needed in cases where an error is encountered when opening a Hydraulics & Hydrology product or model file, with the details of the error mentioning "engineeringlibraries".
Following command can be run from a command line window or Start Menu > Run window. Please be exact with the punctuation and capitalization and type in (then press Enter)
In a 32 bit machine: regsvr32 "C:\Program Files\Common Files\Microsoft Shared\DAO\DAO360.dll"
In a 64 bit machine:regsvr32 "C:\Program Files (x86)\Common Files\Microsoft Shared\DAO\DAO360.dll"
After typing the above command, press Enter and a message similar to the following will be displayed:
An alternative to the above procedure would be to browse to the dao360.dll file, right click, choose to "open with", then browse out to and open it with the regsvr32.exe file, typically located in C:\Windows\System32\.