I have incurred the same problem. When I go to open a file in paint.net, the program crashes. (The same occurs when I attempt to open a file in MS Paint) I went into the registry as you directed but there is no LastFileDialogDirectory in the registry. Although I am confident this is the problem, I'll include the log:
Application version: Paint.NET v3.5.10 (Final Release build 3.510.4297.28964)
Time of crash: 4/23/2012 6:03:21 PM
Application uptime: 00:00:22.3993928
Install directory: C:\Program Files\Paint.NET
Current directory: C:\Program Files\Paint.NET
OS Version: 6.1.7600.0 Workstation x64
.NET version: CLR 2.0.50727.4963 x64, FX 2.0 (rtm sp1 sp2) 3.0 (rtm sp1 sp2) 3.5 (rtm sp1 sp1_CP) 4.0 (rtm)
Processor: 4x "Intel® Core i5 CPU M 460 @ 2.53GHz" @ ~2527MHz (DEP, SSE, SSE2, SSE3, SSSE3, SSE4_1, SSE4_2), fps=0x1
Physical memory: 3893 MB
UI DPI: 96.00 dpi (1.00x scale)
UI Theme: Aero/Aero + DWM (Aero.msstyles)
Updates: true, 4/23/2012
Locale: pdnr.c: en-US, hklm: en-US, hkcu: n/a, cc: en-US, cuic: en-US
Managed assemblies:
mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 @ C:\Windows\Microsoft.NET\Framework64\v2.0.50727\mscorlib.dll
PaintDotNet, Version=3.510.4297.28970, Culture=neutral, PublicKeyToken=null @ C:\Program Files\Paint.NET\PaintDotNet.exe
PaintDotNet.Base, Version=3.510.4297.28957, Culture=neutral, PublicKeyToken=null @ C:\Program Files\Paint.NET\PaintDotNet.Base.dll
System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 @ C:\Windows\assembly\GAC_MSIL\System\2.0.0.0__b77a5c561934e089\System.dll
WindowsBase, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35 @ C:\Windows\assembly\GAC_MSIL\WindowsBase\3.0.0.0__31bf3856ad364e35\WindowsBase.dll
System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 @ C:\Windows\assembly\GAC_MSIL\System.Windows.Forms\2.0.0.0__b77a5c561934e089\System.Windows.Forms.dll
System.Drawing, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a @ C:\Windows\assembly\GAC_MSIL\System.Drawing\2.0.0.0__b03f5f7f11d50a3a\System.Drawing.dll
System.Core, Version=3.5.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 @ C:\Windows\assembly\GAC_MSIL\System.Core\3.5.0.0__b77a5c561934e089\System.Core.dll
PaintDotNet.Core, Version=3.510.4297.28965, Culture=neutral, PublicKeyToken=null @ C:\Program Files\Paint.NET\PaintDotNet.Core.dll
PaintDotNet.SystemLayer, Version=3.510.4297.28964, Culture=neutral, PublicKeyToken=null @ C:\Program Files\Paint.NET\PaintDotNet.SystemLayer.dll
PaintDotNet.Resources, Version=3.510.4297.28964, Culture=neutral, PublicKeyToken=null @ C:\Program Files\Paint.NET\PaintDotNet.Resources.dll
PaintDotNet.Data, Version=3.510.4297.28969, Culture=neutral, PublicKeyToken=null @ C:\Program Files\Paint.NET\PaintDotNet.Data.dll
PaintDotNet.Effects, Version=3.510.4297.28970, Culture=neutral, PublicKeyToken=null @ C:\Program Files\Paint.NET\PaintDotNet.Effects.dll
PaintDotNet.SystemLayer.Native.x64, Version=3.510.4297.28963, Culture=neutral, PublicKeyToken=null @ C:\Program Files\Paint.NET\PaintDotNet.SystemLayer.Native.x64.dll
msvcm90, Version=9.0.30729.6161, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a @ C:\Windows\WinSxS\amd64_microsoft.vc90.crt_1fc8b3b9a1e18e3b_9.0.30729.6161_none_08e61857a83bc251\msvcm90.dll
System.Xml, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 @ C:\Windows\assembly\GAC_MSIL\System.Xml\2.0.0.0__b77a5c561934e089\System.Xml.dll
Native modules:
C:\Program Files\Paint.NET\PaintDotNet.exe, version='3.510.4297.28970'
C:\Windows\SYSTEM32\ntdll.dll, version='6.1.7600.16385 (win7_rtm.090713-1255)'
C:\Windows\SYSTEM32\MSCOREE.DLL, version='4.0.31106.0 (Main.031106-0000)'
C:\Windows\system32\KERNEL32.dll, version='6.1.7600.16385 (win7_rtm.090713-1255)'
C:\Windows\system32\KERNELBASE.dll, version='6.1.7600.16385 (win7_rtm.090713-1255)'
C:\Windows\system32\ADVAPI32.dll, version='6.1.7600.16385 (win7_rtm.090713-1255)'
C:\Windows\system32\msvcrt.dll, version='7.0.7600.16930 (win7_gdr.111215-1720)'
C:\Windows\SYSTEM32\sechost.dll, version='6.1.7600.16385 (win7_rtm.090713-1255)'
C:\Windows\system32\RPCRT4.dll, version='6.1.7600.16385 (win7_rtm.090713-1255)'
C:\Windows\Microsoft.NET\Framework64\v4.0.30319\mscoreei.dll, version='4.0.30319.237 (RTMGDR.030319-2300)'
C:\Windows\system32\SHLWAPI.dll, version='6.1.7600.16385 (win7_rtm.090713-1255)'
C:\Windows\system32\GDI32.dll, version='6.1.7600.16385 (win7_rtm.090713-1255)'
C:\Windows\system32\USER32.dll, version='6.1.7600.16385 (win7_rtm.090713-1255)'
C:\Windows\system32\LPK.dll, version='6.1.7600.16385 (win7_rtm.090713-1255)'
C:\Windows\system32\USP10.dll, version='1.0626.7600.16385 (win7_rtm.090713-1255)'
C:\Windows\system32\IMM32.DLL, version='6.1.7600.16385 (win7_rtm.090713-1255)'
C:\Windows\system32\MSCTF.dll, version='6.1.7600.16385 (win7_rtm.090713-1255)'
C:\Windows\Microsoft.NET\Framework64\v2.0.50727\mscorwks.dll, version='2.0.50727.4963 (win7RTMGDR.050727-4900)'
C:\Windows\WinSxS\amd64_microsoft.vc80.crt_1fc8b3b9a1e18e3b_8.0.50727.4927_none_88dce9872fb18caf\MSVCR80.dll, version='8.00.50727.4927'
C:\Windows\system32\shell32.dll, version='6.1.7600.16385 (win7_rtm.090713-1255)'
C:\Windows\system32\ole32.dll, version='6.1.7600.16385 (win7_rtm.090713-1255)'
C:\Windows\system32\profapi.dll, version='6.1.7600.16385 (win7_rtm.090713-1255)'
C:\Windows\assembly\NativeImages_v2.0.50727_64\mscorlib\89539913ae4a7cd0cb6ca733d6bf699e\mscorlib.ni.dll, version='2.0.50727.4963 (win7RTMGDR.050727-4900)'
C:\Windows\system32\CRYPTBASE.dll, version='6.1.7600.16385 (win7_rtm.090713-1255)'
C:\Windows\system32\uxtheme.dll, version='6.1.7600.16385 (win7_rtm.090713-1255)'
C:\Windows\assembly\NativeImages_v2.0.50727_64\System\3d69c3a887aa1a4b35fdeea64aa5735b\System.ni.dll, version='2.0.50727.4968 (win7RTMGDR.050727-4900)'
C:\Windows\assembly\NativeImages_v2.0.50727_64\System.Core\7b94dfe397b4626f568ff83bd2b6e54e\System.Core.ni.dll, version='3.5.30729.4926 built by: NetFXw7'
C:\Windows\assembly\NativeImages_v2.0.50727_64\WindowsBase\72f21f61357658b9c6b7b4b1a1e33987\WindowsBase.ni.dll, version='3.0.6920.5001 built by: Win7RTMGDR'
C:\Windows\assembly\NativeImages_v2.0.50727_64\System.Drawing\159e60648425189056c3b33fd56480cb\System.Drawing.ni.dll, version='2.0.50727.4974 (win7RTMGDR.050727-4900)'
C:\Windows\assembly\NativeImages_v2.0.50727_64\System.Windows.Forms\1dbbc192e54135e0fc00ce666dccb45b\System.Windows.Forms.ni.dll, version='2.0.50727.4961 (win7RTMGDR.050727-4900)'
C:\Windows\assembly\NativeImages_v2.0.50727_64\PaintDotNet.Base\d0f6e90962e5b0eab19bedf219c4a0db\PaintDotNet.Base.ni.dll, version='3.510.4297.28957'
C:\Windows\assembly\NativeImages_v2.0.50727_64\PaintDotNet.SystemL#\cf7c8e9a9cd9b9dace4662d4e8aaa07c\PaintDotNet.SystemLayer.ni.dll, version='3.510.4297.28964'
C:\Windows\assembly\NativeImages_v2.0.50727_64\PaintDotNet.Resourc#\9abe7d443aafe63c11358b216e66a141\PaintDotNet.Resources.ni.dll, version='3.510.4297.28964'
C:\Windows\system32\CRYPTSP.dll, version='6.1.7600.16385 (win7_rtm.090713-1255)'
C:\Windows\system32\rsaenh.dll, version='6.1.7600.16385 (win7_rtm.090713-1255)'
C:\Windows\assembly\NativeImages_v2.0.50727_64\PaintDotNet.Core\9dac4978229b20cd0ab183a81af1f2c8\PaintDotNet.Core.ni.dll, version='3.510.4297.28965'
C:\Windows\assembly\NativeImages_v2.0.50727_64\PaintDotNet.Data\81fa6d32abcfa3bdbbb92a195a9d8b23\PaintDotNet.Data.ni.dll, version='3.510.4297.28969'
C:\Windows\assembly\NativeImages_v2.0.50727_64\PaintDotNet\d321ecec9b834e2e1b2ab636db79c8b5\PaintDotNet.ni.exe, version='3.510.4297.28970'
C:\Windows\assembly\NativeImages_v2.0.50727_64\PaintDotNet.SystemL#\a9fd06474ea31e653168150c670707c3\PaintDotNet.SystemLayer.Native.x64.ni.dll, version='3.510.0.0'
C:\Windows\assembly\NativeImages_v2.0.50727_64\Interop.WIA\d512683a0f57fb8d8f2cb41d08fa29d8\Interop.WIA.ni.dll, version='1.0.0.0'
C:\Windows\assembly\NativeImages_v2.0.50727_64\PaintDotNet.Effects\55864d197d67461c88a0249147e0b3aa\PaintDotNet.Effects.ni.dll, version='3.510.4297.28970'
C:\Program Files\Paint.NET\Native.x64\PaintDotNet.Native.x64.dll, version='3.510.0.0'
C:\Windows\WinSxS\amd64_microsoft.vc90.crt_1fc8b3b9a1e18e3b_9.0.30729.6161_none_08e61857a83bc251\MSVCR90.dll, version='9.00.30729.6161'
C:\Windows\WinSxS\amd64_microsoft.vc90.openmp_1fc8b3b9a1e18e3b_9.0.30729.6161_none_390d35aa0a1f21f9\VCOMP90.DLL, version='9.00.30729.6161 built by: QFE'
C:\Windows\system32\dwmapi.dll, version='6.1.7600.16385 (win7_rtm.090713-1255)'
C:\Windows\WinSxS\amd64_microsoft.windows.gdiplus_6595b64144ccf1df_1.1.7600.16385_none_2b4f45e87195fcc4\gdiplus.dll, version='6.1.7600.16385 (win7_rtm.090713-1255)'
C:\Windows\Microsoft.NET\Framework64\v2.0.50727\mscorjit.dll, version='2.0.50727.4961 (win7RTMGDR.050727-4900)'
C:\Windows\system32\WindowsCodecs.dll, version='6.1.7600.16385 (win7_rtm.090713-1255)'
C:\Program Files\WIDCOMM\Bluetooth Software\btmmhook.dll, version='6.3.0.5600'
C:\Windows\system32\OLEAUT32.dll, version='6.1.7600.16872'
C:\Windows\system32\PSAPI.DLL, version='6.1.7600.16385 (win7_rtm.090713-1255)'
C:\Windows\WinSxS\amd64_microsoft.windows.common-controls_6595b64144ccf1df_6.0.7600.16661_none_fa62ad231704eab7\comctl32.dll, version='6.10 (win7_rtm.090713-1255)'
C:\Program Files\Paint.NET\PaintDotNet.SystemLayer.Native.x64.dll, version='3.510.0.0'
C:\Windows\WinSxS\amd64_microsoft.vc90.atl_1fc8b3b9a1e18e3b_9.0.30729.6161_none_0a1fd3a3a768b895\ATL90.DLL, version='9.00.30729.6161'
C:\Windows\WinSxS\amd64_microsoft.vc90.crt_1fc8b3b9a1e18e3b_9.0.30729.6161_none_08e61857a83bc251\msvcm90.dll, version='9.00.30729.6161'
C:\Windows\system32\d2d1.dll, version='6.1.7600.16961 (win7_gdr.120209-1505)'
C:\Windows\system32\dwrite.dll, version='6.1.7600.16385 (win7_rtm.090713-1255)'
C:\Windows\system32\RpcRtRemote.dll, version='6.1.7600.16385 (win7_rtm.090713-1255)'
C:\Windows\system32\wtsapi32.dll, version='6.1.7600.16385 (win7_rtm.090713-1255)'
C:\Windows\system32\WINSTA.dll, version='6.1.7600.16385 (win7_rtm.090713-1255)'
C:\Windows\system32\version.dll, version='6.1.7600.16385 (win7_rtm.090713-1255)'
C:\Windows\system32\SetupApi.dll, version='6.1.7600.16385 (win7_rtm.090713-1255)'
C:\Windows\system32\CFGMGR32.dll, version='6.1.7600.16385 (win7_rtm.090713-1255)'
C:\Windows\system32\DEVOBJ.dll, version='6.1.7600.16385 (win7_rtm.090713-1255)'
C:\Windows\system32\WINTRUST.dll, version='6.1.7600.16970 (win7_gdr.120229-1504)'
C:\Windows\system32\CRYPT32.dll, version='6.1.7600.16385 (win7_rtm.090713-1255)'
C:\Windows\system32\MSASN1.dll, version='6.1.7600.16415 (win7_gdr.090828-1615)'
C:\Windows\system32\CLBCatQ.DLL, version='2001.12.8530.16385 (win7_rtm.090713-1255)'
C:\Windows\assembly\NativeImages_v2.0.50727_64\System.Xml\e27a134ab834ece4ba174b926a825e15\System.Xml.ni.dll, version='2.0.50727.4927 (NetFXspW7.050727-4900)'
C:\Windows\System32\comdlg32.dll, version='6.1.7600.16385 (win7_rtm.090713-1255)'
Exception details:
System.Runtime.InteropServices.SEHException: External component has thrown an exception.
at System.Windows.Forms.OpenFileDialog.CreateVistaDialog()
at System.Windows.Forms.FileDialog.RunDialogVista(IntPtr hWndOwner)
at System.Windows.Forms.CommonDialog.ShowDialog(IWin32Window owner)
at PaintDotNet.SystemLayer.ClassicFileDialog.ShowDialog(IWin32Window owner) in D:\src\pdn\pdn_35x\src\SystemLayer\ClassicFileDialog.cs:line 137
at PaintDotNet.Controls.DocumentWorkspace.ShowFileDialog(Control owner, IFileDialog fd, Boolean populateInitialDir) in D:\src\pdn\pdn_35x\src\PaintDotNet\Controls\DocumentWorkspace.cs:line 1734
at PaintDotNet.Controls.DocumentWorkspace.ChooseFiles(Control owner, String[]& fileNames, Boolean multiselect, String startingDir) in D:\src\pdn\pdn_35x\src\PaintDotNet\Controls\DocumentWorkspace.cs:line 1825
at PaintDotNet.Actions.OpenFileAction.PerformAction(AppWorkspace appWorkspace) in D:\src\pdn\pdn_35x\src\PaintDotNet\Actions\OpenFileAction.cs:line 41
at PaintDotNet.Controls.AppWorkspace.PerformAction(AppWorkspaceAction performMe) in D:\src\pdn\pdn_35x\src\PaintDotNet\Controls\AppWorkspace.cs:line 1879
at System.Windows.Forms.ToolStripItem.RaiseEvent(Object key, EventArgs e)
at System.Windows.Forms.ToolStripMenuItem.OnClick(EventArgs e)
at PaintDotNet.Menus.PdnMenuItem.OnClick(EventArgs e) in D:\src\pdn\pdn_35x\src\PaintDotNet\Menus\PdnMenuItem.cs:line 302
at System.Windows.Forms.ToolStripItem.HandleClick(EventArgs e)
at System.Windows.Forms.ToolStripItem.HandleMouseUp(MouseEventArgs e)
at System.Windows.Forms.ToolStrip.OnMouseUp(MouseEventArgs mea)
at System.Windows.Forms.ToolStripDropDown.OnMouseUp(MouseEventArgs mea)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ToolStrip.WndProc(Message& m)
at System.Windows.Forms.ToolStripDropDown.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
