Is there any reliable way to check if powerpoint and word documents are password protected in VBA?

I am trying to create a function that would check if docx or pptx files are password protected. Here is my function:

 Public Function isPasswordProtected(ByVal path As String) As Boolean
    On Error GoTo ErrorHandler
    Dim wordApp As Word.Application
    Dim wordFile As Object
    
    
    Set wordApp = New Word.Application
    wordApp.Visible = False
 
    Set wordFile = Documents.Open(fileName:=path, PasswordDocument:="!@#$%")
    If Err = 0 Then ' no error occurred
        isPasswordProtected = False
    Else
        isPasswordProtected = True
    End If
    
    wordFile.Close (False)
    wordApp.Quit
    Set wordApp = Nothing
    Set wordFile = Nothing
    isPasswordProtected = True
ErrorHandler:
    Debug.Print "isPasswordProtected( ):" & Err.Description
End Function

Sub TestProtection()

    Dim protected As String
    Dim unrpotected As String
    
    protected = "C:\Temp\word\protected.docx"
    Debug.Print isPasswordProtected(protected)
    unrpotected = "C:\Temp\word\unprotected.docx"
    Debug.Print isPasswordProtected(unrpotected)
    
End Sub

I does work but not reliably from time to time it just throws the following error: isPasswordProtected():The remote server machine does not exist or is unavailable

Rather than:

isPasswordProtected( ):The password is incorrect. Word cannot open the document.
 (C:\Temp\word\protected.docx)
False
isPasswordProtected( ):
True

And when I am checking lots of documents its a problem. Are there any alternative ways of doing that?

Try this version of your function

 Public Function isPasswordProtected(ByVal path As String) As Boolean
    On Error GoTo ErrorHandler
    Dim wordApp As Word.Application
    Dim wordFile As Word.Document
    
    
    Set wordApp = New Word.Application
    wordApp.Visible = False
 
    Set wordFile = wordApp.Documents.Open(Filename:=path, PasswordDocument:="!@#$%")
    If Err = 0 Then ' no error occurred
        isPasswordProtected = False
    Else
        isPasswordProtected = True
    End If
    
    wordFile.Close (False)
    wordApp.Quit
    Set wordApp = Nothing
    Set wordFile = Nothing
Exit Function
ErrorHandler:
    Debug.Print "isPasswordProtected( ):" & Err.Description & vbNewLine
    wordApp.Quit
    Set wordApp = Nothing
    Set wordFile = Nothing
    isPasswordProtected = True
End Function