EDIT:
Sorry i didn't see the others post (Kaspar's problem, it's the same) XD so it's almost useless this post

I have to try your update.
Anyway here my info:
- Net framework 4.5.1
- 3dsmax Ver. 2015 x64
- Stage a0stg100.x (Edea's room)
- Search model (strict) 9216 for example (Vertices offset 0x2406 - Triangles // - Quads 0x248C)
And when i try to import it from the menù (and not with a drag and drop) , i got that error.
Meanwhile with a classic and fast drag and drop, nothing happens & nothing import.
Here the main file and the obj (9216) extracted (without any mtl, doesn't matter in this moment)
Link ->
www.mediafire.com/download/l4t6rrm8ab7av9w/Model.rar
Oh and sometimes when i try to extract some quads model (in the same file you can try the 9720) i got an error from the program, here the log:
Le informazioni su come richiamare il debug JIT (Just-In-Time) anziché questa finestra
sono riportate in fondo al messaggio.
************** Testo dell'eccezione **************
System.FormatException: Formato della stringa di input non corretto.
in System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal)
in System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info)
in System.Byte.Parse(String s, NumberStyles style, NumberFormatInfo info)
in FF8_StageModel_ToObj.Form1.button5_Click(Object sender, EventArgs e)
in System.Windows.Forms.Control.OnClick(EventArgs e)
in System.Windows.Forms.Button.OnClick(EventArgs e)
in System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
in System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
in System.Windows.Forms.Control.WndProc(Message& m)
in System.Windows.Forms.ButtonBase.WndProc(Message& m)
in System.Windows.Forms.Button.WndProc(Message& m)
in System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
in System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
in System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
************** Assembly caricati **************
mscorlib
Versione assembly: 4.0.0.0
Versione Win32: 4.0.30319.18444 built by: FX451RTMGDR
Base di codice: file:///C:/Windows/Microsoft.NET/Framework/v4.0.30319/mscorlib.dll
----------------------------------------
Final Fantasy VIII Battle stage model to OBJ
Versione assembly: 0.8.0.0
Versione Win32: 0.8.0.0
Base di codice: file:///C:/Users/Administrator/Desktop/FF8%20.X%20to%20OBJ.exe
----------------------------------------
System.Windows.Forms
Versione assembly: 4.0.0.0
Versione Win32: 4.0.30319.18408 built by: FX451RTMGREL
Base di codice: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Windows.Forms/v4.0_4.0.0.0__b77a5c561934e089/System.Windows.Forms.dll
----------------------------------------
System.Drawing
Versione assembly: 4.0.0.0
Versione Win32: 4.0.30319.18408 built by: FX451RTMGREL
Base di codice: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Drawing/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll
----------------------------------------
System
Versione assembly: 4.0.0.0
Versione Win32: 4.0.30319.34238 built by: FX452RTMGDR
Base di codice: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System/v4.0_4.0.0.0__b77a5c561934e089/System.dll
----------------------------------------
mscorlib.resources
Versione assembly: 4.0.0.0
Versione Win32: 4.0.30319.18408 built by: FX451RTMGREL
Base di codice: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/mscorlib.resources/v4.0_4.0.0.0_it_b77a5c561934e089/mscorlib.resources.dll
----------------------------------------
System.Windows.Forms.resources
Versione assembly: 4.0.0.0
Versione Win32: 4.0.30319.18408 built by: FX451RTMGREL
Base di codice: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Windows.Forms.resources/v4.0_4.0.0.0_it_b77a5c561934e089/System.Windows.Forms.resources.dll
----------------------------------------
************** Debug JIT **************
Per abilitare il debug JIT, è necessario impostare il valore
jitDebugging nella sezione system.windows.forms del file di configurazione
dell'applicazione o del computer (machine.config).
L'applicazione inoltre deve essere compilata con il debug
abilitato.
Ad esempio:
<configuration>
<system.windows.forms jitDebugging="true" />
</configuration>
Quando il debug JIT è abilitato, tutte le eccezioni non gestite
vengono inviate al debugger JIT registrato nel computer,
anziché essere gestite da questa finestra di dialogo.
Sorry for some parts on the log in italian languages

(I'm italian

)