trying to get Error Number

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I have a .chm that is called by a cmdButton:

Shell "HH.exe " & CurrentProject.Path & "\myfile.chm", vbNormalFocus

which works, fine, but am trying to give User more info if they delete or move
the .chm file from ProjectPath.

When I try to get an Error number by renaming the chm, I get a dialog box with
"Help" as the title, and just a line that says:
Cannot open the file: (path)\myfile.chm.
It appears that the help compiler generated the diaglog box?

Is there a particular error I can trap to generate a more detailed error
message, or should I just check to see if the file exists in the proper location
before calling the chm file. If the latter, how do I do that?

Thanks, John


.

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