Setting Function Key to open up Inroads

I want to set up a Function Key to open up Inroads when I hit F3. I know my civustat program is located here:

C:\Program Files (x86)\Bentley\PowerRailTrack V8i\PowerRailTrack\InRoadsGroup\bin

so I tried a Function Key set to F3 with this info:

mdl l "C:\Program Files (x86)\Bentley\PowerRailTrack V8i\PowerRailTrack\InRoadsGroup\bin\civustat"

But I get a couple error messages:

OS could not load C:\Program Files (x86)\Bentley\PowerRailTrack v8i\PowerRailTrack\InroadsGroup\bin\CivUstAT.dll, error 126.

and then:

MDL Loader: Unable to load library (DLL or MDL shared library) CivUstAT

I'm using Microstation V8i select series 3 and Inroads SS3

Any thoughts?

As a side note, to launch inroads, I currently go to Utilities > mdl Applications, click browse, and open civustat.