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Doublequotes for variables

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Hi,
I wrote a very simple script (actually my first transit from macros to scripts) to render specific viewports. It should let you pick a folder and render the views into it named accordingly.

Problem occures when using a folder that contains spaces. Forums say put your strings in quotes but how do I quote a string in a variable?

Option Explicit

Call RenderVisu()
Sub RenderVisu()

Dim folder  
folder = Rhino.BrowseForFolder
If IsNull(folder) Then Exit Sub

Dim answer
answer = Rhino.MessageBox(folder, 1)
If answer = 2 Then Exit Sub

Rhino.Command "_-SetActiveViewport 01_TOP"
Rhino.Command "_Render _-SaveRenderWindowAs " & folder & "01_TOP.png" 
Rhino.Command "_CloseRenderWindow"

Rhino.Command "_-SetActiveViewport 02_BOTTOM"
Rhino.Command "_Render _-SaveRenderWindowAs " & folder & "02_BOTTOM.png"
Rhino.Command "_CloseRenderWindow"

Rhino.MessageBox("Done")

End Sub

Thanks in advance

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