What causes this try statement to go to catch?

[killmerat]

Sorry if the question wasn't clear, it'd be too much to type if it were.

I found some code a few days ago that reads the executable path of every process but returns an error when trying to get certain processes. I didn't make all of this code :

        Dim example as integer
        Dim file2 As String
        For Each p As Process In Process.GetProcesses
            Try
                file2 = p.Modules(0).FileName
            Catch ex2 As System.ComponentModel.Win32Exception
                file2 = "n/a"
            End Try
            If file2 = "C:\example.exe" Then
                example += 1
            End If
        Next

I need to know exactly what causes it to return "n/a" because if I were to make present to me the information from, for example, a messagebox, some processes will return "n/a" and I need it to not do that or figure out another way of grabbing the executable paths.

I don't want just the filename, anyone can bypass that and if it has the same name as "explorer.exe" for example, that could cause a problem.

[PsychoCoder]

In your catch statement add MessageBox.Show(ex2.Message) and that will give you the actual error. I presume it's a permission issue and this will let you know