How To Determine Excel File is Password Protected

How can I use VBA in an Excel file to determine if another Excel file is password protected, preferably without opening the file?
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Chuck WoodAsked:
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Wayne Taylor (webtubbs)Commented:
It's not possible without attempting to open the workbook. But you can try opening the file using a dummy password and it will return an error if the password is wrong. If it's not password protected, it will open as normal despite providing a password.

Function IsPasswordProtected(sFile As String) As Boolean

    On Error Resume Next
    Workbooks.Open(Filename:=sFile, Password:="dummypassword").Close SaveChanges:=False
    If Err.Number Then
        IsPasswordProtected = True
    End If
    Err.Clear
    
End Function

Sub test()

    MsgBox IsPasswordProtected("C:\tests\Book1.xlsx")
    
End Sub

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Chuck WoodAuthor Commented:
Excellent answer. Thank you.
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