Simple read file macro in Excel VBA on Mac OS X

Longtime VBA programmer, first time on a Mac. Having trouble understanding why this doesn't work. Specifically, when it gets to

Code:

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While Not EOF(filenum)

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, I get "Run-time error '52': Bad file name or number". However beforehand Excel opened a dialog box to confirm access to the file, so I know it's there. Also when I do "?Dir(filename)" in the immediate window it returns the filename.

I'm confused. Must be an OS X issue somehow but I'm not sure where or how. Any help would be greatly appreciated.

Code:

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Function reload()
    Dim desktop As String
    Dim filename As String
    Dim filenum As Integer
    Dim file_line As String
    Dim arr() As Variant
    Dim i As Long
    Dim j As Long
   
    desktop = MacScript("return (path to desktop folder) as String")
    filename = desktop & Range("Filename").Value
   
    Sheets("Raw").Cells.Clear
   
    Debug.Print (filename)
    filenum = FreeFile()
    i = 1
    Open filename For Input As #filenum
    While Not EOF(filenum)
        Line Input #filenum, file_line
        arr = Split(file_line, ",")
        For j = LBound(arr, 1) To UBound(arr, 1)
            Sheets("Raw").Cells(i, j) = arr(j)
        Next j
        i = i + 1
    Wend
    Close #1
End Function

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