C# Signature:

/// <summary>
/// Determines whether a path to a file system object such as a file or directory is valid.
/// </summary>
/// <param name="pszPath">A pointer to a null-terminated string of maximum length MAX_PATH that contains the full path of the object to verify.</param>
/// <returns>Returns TRUE if the file exists, or FALSE otherwise. Call GetLastError for extended error information.</returns>
[System.Runtime.InteropServices.DllImport("shlwapi.dll", EntryPoint = "PathFileExistsW",  SetLastError = true, CharSet = CharSet.Unicode)]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool PathFileExists([MarshalAs(UnmanagedType.LPTStr)]string pszPath);

VB.NET Signature

''' <summary>
''' Determines whether a path to a file system object such as a file or directory is valid.
''' </summary>
''' <param name="pszPath">A pointer to a null-terminated string of maximum length MAX_PATH that contains the full path of the object to verify.</param>
''' <returns>Returns TRUE if the file exists, or FALSE otherwise. Call GetLastError for extended error information.</returns>
<System.Runtime.InteropServices.DllImport("shlwapi.dll", EntryPoint:="PathFileExistsW",  SetLastError:=True, CharSet:=CharSet.Unicode)> _
Public Shared Function PathFileExists(<MarshalAs(UnmanagedType.LPTStr)>pszPath As String) As <MarshalAs(UnmanagedType.Bool)> Boolean
End Function

VB Signature:

Public Declare Function PathFileExists Lib "shlwapi" Alias "PathFileExistsA" _
        (ByVal pszPath As String) As Long

User-Defined Types:

None.

Alternative Managed API:

C#: bool System.IO.File.Exists(string path)
VB.Net: System.IO.File.Exists(path as String) as Boolean

https://msdn.microsoft.com/en-us/library/system.io.file.exists.aspx

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Notes:

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Sample Code:

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