C# Signature:

[DllImport("psapi.dll")]
static extern uint GetModuleFileNameEx(IntPtr hProcess, IntPtr hModule, [Out] StringBuilder lpBaseName, [In] [MarshalAs(UnmanagedType.U4)] int nSize);

VB.NET Signature:

<DllImport("psapi.dll")> _
Public Shared Function GetModuleFileNameEx(ByVal hProcess As IntPtr, ByVal hModule As IntPtr, <Out()> ByVal lpBaseName As StringBuilder, <[In]()> <MarshalAs(UnmanagedType.U4)> ByVal nSize As Integer) As UInteger
End Function

User-Defined Types:

None.

Alternative Managed API:

Do you know one? Please contribute it!

Notes:

I had trouble using the original C# signature above, but found that this one works:
[DllImport("psapi.dll", CallingConvention=CallingConvention.StdCall, CharSet=CharSet.Unicode)]
static extern uint GetModuleFileNameEx(IntPtr hProcess, IntPtr hModule, [Out] StringBuilder lpBaseName, uint nSize);

Tips & Tricks:

Please add some!

Sample Code:

Using this method in conjuction with EnumProcessModules:

        Process[] pc = Process.GetProcessesByName("Communicator");

        foreach (Process p in pc)
        {
        // Setting up the variable for the second argument for EnumProcessModules
        IntPtr[] hMods = new IntPtr[1024];

        GCHandle gch = GCHandle.Alloc(hMods, GCHandleType.Pinned); // Don't forget to free this later
        IntPtr pModules = gch.AddrOfPinnedObject();

        // Setting up the rest of the parameters for EnumProcessModules
        uint uiSize = (uint)(Marshal.SizeOf(typeof(IntPtr)) * (hMods.Length));
        uint cbNeeded = 0;

        if (EnumProcessModules(p.Handle, pModules, uiSize, out cbNeeded) == 1)
        {
            Int32 uiTotalNumberofModules = (Int32)(cbNeeded / (Marshal.SizeOf(typeof(IntPtr))));

            for (int i = 0; i < (int)uiTotalNumberofModules; i++)
            {
            StringBuilder strbld = new StringBuilder(1024);

            GetModuleFileNameEx(p.Handle, hMods[i], strbld, (uint)(strbld.Capacity));
            Console.WriteLine("File Path: " + strbld.ToString());
            Console.WriteLine();
            }
            Console.WriteLine("Number of Modules: " + uiTotalNumberofModules);
            Console.WriteLine();
        }

        // Must free the GCHandle object
        gch.Free();
        }

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