Each time we open a file this warning pops up: Unable to find style specified by HVAC_CUT_HIDDEN_LINESTYLE: (Hidden). How do we get rid of this?
The error indicates that the configuration variable HVAC_CUT_HIDDEN_LINESTYLE is set to a value of "(Hidden)", which is the default, and that the "(Hidden)" line style is not available in your workspace. By default, {hidden} is found in the folder, C:\ProgramData\Bentley\AECOsimBuildingDesigner V8i Ss6\WorkSpace\System\symb\acadlsty.rsc.
You can either re-define HVAC_CUT_HIDDEN_LINESTYLE equal to an available linestyle or supply acadlsty.rsc to the folder in which all linestyles are read.