Out of memory

<Try to describe precise steps that lead to the problem (where do you click, what keys do you press, what do you see, etc.)>
<If relevant, consider attaching a session log file or a screenshot)>

WinSCP 5.6.3

Error message:
Out of memory

Stack trace:
[0074C986] System::Sysutils::WideStrAlloc
[0074C986] System::Sysutils::WideStrAlloc
[005DBA99] Vcl::Controls::TWinControl::WndProc
[005DB0E0] Vcl::Controls::TWinControl::MainWndProc
[006FF9BC] System::Classes::_18201
[77578E6F] USER32.DLL.CallNextHookEx
[775790CC] USER32.DLL
[77579327] USER32.DLL
[77579527] USER32.DLL
[777E0CA4] ntdll.dll.KiUserCallbackDispatcher
[00598ABF] Vcl::Forms::TCustomForm::DestroyWindowHandle
[003C5D71] Vcl::Forms::TForm::~TForm
[00AFCE09] TEditorForm::~TEditorForm
[0076FC94] System::TObject::Free
[005DBA99] Vcl::Controls::TWinControl::WndProc
[0059683C] Vcl::Forms::TCustomForm::WndProc
[00B40D29] Vclcommon::C2444_0
[005DB0E0] Vcl::Controls::TWinControl::MainWndProc
[006FF9BC] System::Classes::_18201
[77578E6F] USER32.DLL.CallNextHookEx
[775790CC] USER32.DLL
[7757A66A] USER32.DLL
[7757A6DB] USER32.DLL.DispatchMessageW

Thanks for your report.
I have sent you an email with a debug version of WinSCP to address you have used to register on this forum.

Tried to open a very big zip file (500mb)

WinSCP 5.7.6

Error message:
Out of memory

Stack trace:
(0038D222) System::Sysutils::WideStrAlloc
(0038D222) System::Sysutils::WideStrAlloc
(0021C315) Vcl::Controls::TWinControl::WndProc
(0021B95C) Vcl::Controls::TWinControl::MainWndProc
(003402A8) System::Classes::_18201
(000152F7) USER32.dll
(00015D35) USER32.dll
(00015DE8) USER32.dll
(00015E49) USER32.dll
(0000F137) ntdll.dll.KiUserCallbackDispatcher
(001D933B) Vcl::Forms::TCustomForm::DestroyWindowHandle
(00004D85) Vcl::Forms::TForm::~TForm
(0074947D) TEditorForm::~TEditorForm
(003B0530) System::TObject::Free
(0021C315) Vcl::Controls::TWinControl::WndProc
(001D70B8) Vcl::Forms::TCustomForm::WndProc
(0078D54D) Vclcommon::C2516_0
(0021B95C) Vcl::Controls::TWinControl::MainWndProc
(003402A8) System::Classes::_18201
(000152F7) USER32.dll
(00015D35) USER32.dll
(000167CE) USER32.dll
(00016895) USER32.dll.DispatchMessageW

I know how to reproduce the problem or the problem happens frequently enough. I wish to be contacted by the WinSCP team to help resolving the problem.

Thanks for your report.

<Try to describe precise steps that lead to the problem (where do you click, what keys do you press, what do you see, etc.)>
<If relevant, consider attaching a session log file or a screenshot)>

WinSCP 5.7.6

Error message:
Out of memory

Stack trace:
(0038D222) System::Sysutils::WideStrAlloc
(0038D222) System::Sysutils::WideStrAlloc
(0021C315) Vcl::Controls::TWinControl::WndProc
(0021B95C) Vcl::Controls::TWinControl::MainWndProc
(003402A8) System::Classes::_18201
(00033921) USER32.dll
(0001378B) USER32.dll
(0001336B) USER32.dll
(0001A177) USER32.dll
(00069E44) ntdll.dll.KiUserCallbackDispatcher
(001D933B) Vcl::Forms::TCustomForm::DestroyWindowHandle
(00004D85) Vcl::Forms::TForm::~TForm
(0074947D) TEditorForm::~TEditorForm
(003B0530) System::TObject::Free
(0021C315) Vcl::Controls::TWinControl::WndProc
(001D70B8) Vcl::Forms::TCustomForm::WndProc
(0078D54D) Vclcommon::C2516_0
(0021B95C) Vcl::Controls::TWinControl::MainWndProc
(003402A8) System::Classes::_18201
(00033921) USER32.dll
(0001378B) USER32.dll
(0001308C) USER32.dll
(00012E4B) USER32.dll.DispatchMessageW

The problem happens rarely. I cannot reproduce it.