pinvoke.net: Edit: psapi.GetProcessImageFileName

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Summary: Retrieves the name of the executable file for the specified process.

!!!!C# Signature:
 [DllImport("psapi.dll")]
 static extern uint GetProcessImageFileName(
	IntPtr hProcess, 
	[Out] StringBuilder lpImageFileName, 
	[In] [MarshalAs(UnmanagedType.U4)] int nSize
 );

!!!!VB Signature:
 Declare Function GetProcessImageFileName Lib "psapi.dll" 
 <DllImport("psapi.dll")> _
 Public Shared Function GetProcessImageFileName(
	ByVal hProcess As IntPtr,
	<Out> lpImageFileName As StringBuilder,
	<[In]> <MarshalAs(UnmanagedType.U4)> uSize As Integer
 ) As UInteger
 End Function

!!!!User-Defined Types:
None.

!!!!Alternative Managed API:
Do you know one?  Please contribute it!

!!!!Notes:
From MSDN: The GetProcessImageFileName function returns the path in device form, rather than drive letters. For example, the file name C:\Winnt\System32\Ctype.nls would look as follows in device form:

\Device\Harddisk0\Partition1\WINNT\System32\Ctype.nls

This can be used in place of the GetModuleFileName call, which doesn't work on processes that haven't been loaded by the current one.

!!!!Tips & Tricks:
I found this to be more comprehensive than GetModuleFileNameEx. Didnt need to enumerate windows or modules

!!!!Sample Code:
Context: Purpose of program is finding the executable under the mouse cursor..a Point

uint pid = 0;
 StringBuilder fileName = new StringBuilder(2000);

/** get the handle for point under cursor **/
 IntPtr hWnd = WindowFromPoint(pt);

/** Need to get the process ID from handle under cursor **/
 GetWindowThreadProcessId(hWnd, out pid);

/** Hook into process **/
 IntPtr pic = OpenProcess(NativeMethods.ProcessAccessFlags.All, true, (int)pid);

/** This gets the filename of the process image. Path is in device format **/
 GetProcessImageFileName(pic, fileName, 2000);

MessageBox.Show(fileName.ToString());

Documentation: GetProcessImageFileName@msdn on MSDN