Got Visual Studio installed?
If so, open HlpViewer.exe and add/download "Windows Desktop Application Development"
Compiler following code to PbHlpViewer.exe (edit commandline to fit your needs, I'm using VS2015 Community)
Code:
If CountProgramParameters() = 1
search$ = ProgramParameter(0)
If Right(search$, 1) = "_"
search$ = RTrim(search$, "_")
RunProgram("C:\Program Files (x86)\Microsoft Help Viewer\v2.2\HlpViewer.exe", "/catalogName VisualStudio14 /launchingApp Microsoft,VisualStudio,14 /helpQuery " + Chr(34) + "method=f1&query=" + search$ + Chr(34), "")
EndIf
EndIf
Create a new IDE Tool entry
Code:
Commandline: ...\PathTo\PbHlpViewer.exe
Arguments: %WORD
Event: Menu Or Shortcut
... and pick a Shortcut
Place the cursor over an API command and press the Shortcut.