Code:
Option Explicit
'////////////////////////////////////////////
'// Module for calling Unicode InputBox    //
'// Copyright (c) 2024-02-01 by HackerVlad //
'// e-mail: [email protected]     //
'// Version 2.5                            //
'////////////////////////////////////////////

Private Declare Function DialogBoxParam Lib "user32" Alias "DialogBoxParamW" (ByVal hInstance As Long, ByVal lpTemplate As Long, ByVal hWndParent As Long, ByVal lpDialogFunc As Long, ByVal dwInitParam As Long) As Long
Private Declare Function LoadLibrary Lib "kernel32" Alias "LoadLibraryW" (ByVal lpLibFileName As Long) As Long
Private Declare Function EndDialog Lib "user32" (ByVal hDlg As Long, ByVal nResult As Long) As Long
Private Declare Function SendDlgItemMessage Lib "user32" Alias "SendDlgItemMessageW" (ByVal hDlg As Long, ByVal nIDDlgItem As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Private Declare Function SetDlgItemText Lib "user32" Alias "SetDlgItemTextW" (ByVal hDlg As Long, ByVal nIDDlgItem As Long, ByVal lpString As Long) As Long
Private Declare Function GetDlgItemText Lib "user32" Alias "GetDlgItemTextW" (ByVal hDlg As Long, ByVal nIDDlgItem As Long, ByVal lpString As Long, ByVal nMaxCount As Long) As Long
Private Declare Function GetDlgItem Lib "user32" (ByVal hDlg As Long, ByVal nIDDlgItem As Long) As Long
Private Declare Function ShowWindow Lib "user32" (ByVal hwnd As Long, ByVal nCmdShow As Long) As Long
Private Declare Function SetWindowText Lib "user32" Alias "SetWindowTextW" (ByVal hwnd As Long, ByVal lpString As Long) As Long
Private Declare Function GetWindowRect Lib "user32" (ByVal hwnd As Long, lpRect As RECT) As Long
Private Declare Function SetWindowPos Lib "user32" (ByVal hwnd As Long, ByVal hWndInsertAfter As Long, ByVal x As Long, ByVal y As Long, ByVal CX As Long, ByVal CY As Long, ByVal wFlags As Long) As Long
Private Declare Function SystemParametersInfo Lib "user32" Alias "SystemParametersInfoA" (ByVal uAction As Long, ByVal uParam As Long, lpvParam As Any, ByVal fuWinIni As Long) As Long
Private Declare Function WinHelp Lib "user32" Alias "WinHelpW" (ByVal hwnd As Long, ByVal lpHelpFile As Long, ByVal wCommand As Long, ByVal dwData As Long) As Long
Private Declare Function HtmlHelp Lib "hhctrl.ocx" Alias "HtmlHelpW" (ByVal hwndCaller As Long, ByVal pszFile As Long, ByVal uCommand As Long, ByVal dwData As Long) As Long

Private Const IDOK = 1
Private Const IDCANCEL = 2
Private Const ID_EDIT = 4900
Private Const ID_STATIC = 4901
Private Const ID_HELP = 4902
Private Const WM_COMMAND = &H111
Private Const WM_INITDIALOG = &H110
Private Const WM_HELP = &H53
Private Const WM_DESTROY = &H2

Private Const SW_HIDE = 0
Private Const SWP_NOSIZE = &H1
Private Const SWP_NOZORDER = &H4
Private Const WM_GETTEXTLENGTH As Long = &HE
Private Const EM_SETSEL = &HB1
Private Const SPI_GETWORKAREA = 48
Private Const HH_DISPLAY_TOPIC = &H0
Private Const HH_HELP_CONTEXT = &HF
Private Const HELP_CONTEXT = &H1
Private Const HELP_INDEX = &H3
Private Const HELP_QUIT = &H2

Private Type RECT
    iLeft As Long
    iTop As Long
    iRight As Long
    iBottom As Long
End Type

Dim sInputText As String
Dim sTitleText As String
Dim sDefaultText As String
Dim CenterOnWorkspace As Boolean ' Analog of DS_CENTER
Dim iXPos As Integer
Dim iYPos As Integer
Dim sHelpFile As String
Dim lContext As Long
Dim IsWinHelpRunning As Boolean

' Call InputBox from msvbvm60.dll with unicode support
Public Function InputBoxW(ByVal hParent As Long, ByVal strPrompt As String, Optional ByVal strTitle As String, Optional ByVal strDefault As String, Optional intXPos As Integer, Optional intYPos As Integer, Optional strHelpFile As String, Optional intContext As Long, Optional CenterOnMonitorWorkspace As Boolean) As String
    Dim msvbvm60 As Long
    
    msvbvm60 = LoadLibrary(StrPtr("msvbvm60.dll"))
    
    If msvbvm60 <> 0 Then
        sTitleText = strTitle
        sDefaultText = strDefault
        CenterOnWorkspace = CenterOnMonitorWorkspace
        iXPos = intXPos
        iYPos = intYPos
        sHelpFile = strHelpFile
        lContext = intContext
        IsWinHelpRunning = False
        
        DialogBoxParam msvbvm60, 4031, hParent, AddressOf DlgProc, StrPtr(strPrompt) ' The very cherished code that calls InputBox
    End If
    
    InputBoxW = sInputText
    sInputText = vbNullString
    sTitleText = vbNullString
    sDefaultText = vbNullString
    sHelpFile = vbNullString
End Function

' Dialog box message processing function
Private Function DlgProc(ByVal hwndDlg As Long, ByVal uMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
    Dim NotifyCode As Long
    Dim ItemID As Long
    Dim wndRect As RECT
    Dim rcWork As RECT
    Dim TextLen As Long
    Dim lLeft As Long
    Dim lTop As Long
    
    Select Case uMsg
        Case WM_INITDIALOG
            If Len(sTitleText) = 0 Then sTitleText = App.Title
            SetWindowText hwndDlg, StrPtr(sTitleText)
            
            If Len(sHelpFile) = 0 Then
                ShowWindow GetDlgItem(hwndDlg, ID_HELP), SW_HIDE
            End If
            
            SetDlgItemText hwndDlg, ID_STATIC, lParam
            
            ' Determining the size of the window
            GetWindowRect hwndDlg, wndRect
            
            ' Determine the size of the working area of the screen
            SystemParametersInfo SPI_GETWORKAREA, 0, rcWork, 0
            
            If CenterOnWorkspace = False Then ' Standard alignment
                If (iXPos Or iYPos) = 0 Then
                    ' Absolutely perfect dialog box alignment code, exactly like the original InputBox function does
                    lLeft = rcWork.iLeft + (rcWork.iRight - rcWork.iLeft - (wndRect.iRight - wndRect.iLeft)) \ 2
                    lTop = rcWork.iTop + (rcWork.iBottom - rcWork.iTop - (wndRect.iBottom - wndRect.iTop)) \ 3
                Else
                    lLeft = iXPos
                    lTop = iYPos
                End If
            Else ' Centering on the working area of the screen (analogous to the DS_CENTER style)
                lLeft = ((rcWork.iRight - rcWork.iLeft) - (wndRect.iRight - wndRect.iLeft)) / 2
                lTop = ((rcWork.iBottom - rcWork.iTop) - (wndRect.iBottom - wndRect.iTop)) / 2
            End If
            
            SetWindowPos hwndDlg, 0, lLeft, lTop, 0, 0, SWP_NOSIZE Or SWP_NOZORDER ' Alignment of the dialog box
            
            If Len(sDefaultText) > 0 Then
                SetDlgItemText hwndDlg, ID_EDIT, StrPtr(sDefaultText)
                SendDlgItemMessage hwndDlg, ID_EDIT, EM_SETSEL, 0, -1
            End If
            
            DlgProc = 1
            Exit Function
        
        Case WM_COMMAND
            NotifyCode = wParam \ 65536
            ItemID = wParam And 65535
            
            If ItemID = IDOK Then
                TextLen = SendDlgItemMessage(hwndDlg, ID_EDIT, WM_GETTEXTLENGTH, 0, 0)
                sInputText = Space$(TextLen)
                GetDlgItemText hwndDlg, ID_EDIT, StrPtr(sInputText), TextLen + 1
                
                EndDialog hwndDlg, 0
                DlgProc = 1
                Exit Function
            End If
            
            If ItemID = IDCANCEL Then
                EndDialog hwndDlg, 0
                DlgProc = 1
                Exit Function
            End If
            
            If ItemID = ID_HELP Then
                RunHelp hwndDlg
                DlgProc = 1
                Exit Function
            End If
        
        Case WM_HELP
            RunHelp hwndDlg
            DlgProc = 1
            Exit Function
        
        Case WM_DESTROY
            If IsWinHelpRunning = True Then
                WinHelp hwndDlg, 0, HELP_QUIT, 0 ' Close the HLP window
            End If
            
            DlgProc = 1
            Exit Function
    End Select
    
    DlgProc = 0
End Function

Private Sub RunHelp(ByVal hwnd As Long)
    If Len(sHelpFile) > 0 Then
        If Right$(sHelpFile, 4) = ".hlp" Then
            If lContext = 0 Then
                WinHelp hwnd, StrPtr(sHelpFile), HELP_INDEX, 0
            Else
                WinHelp hwnd, StrPtr(sHelpFile), HELP_CONTEXT, lContext
            End If
            IsWinHelpRunning = True
        Else ' CHM
            If lContext = 0 Then
                HtmlHelp hwnd, StrPtr(sHelpFile), HH_DISPLAY_TOPIC, 0
            Else
                HtmlHelp hwnd, StrPtr(sHelpFile), HH_HELP_CONTEXT, lContext
            End If
        End If
    End If
End Sub