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

<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 5.21.6

Error message:
Privileged instruction

Traza de la pila:
(0037FCAC) System::Variants::VarToCurrency
(00097C6F) ntdll.dll
(00077BA1) ntdll.dll.KiUserExceptionDispatcher
(000AED6A) MSFTEDIT.DLL
(001F1264) MSFTEDIT.DLL.RichEditWndProc
(00031331) USER32.dll
(000220E1) USER32.dll
(00021A52) USER32.dll.CallWindowProcW
(002825A2) Vcl::Controls::TWinControl::DefaultHandler
(00282491) Vcl::Controls::TWinControl::WndProc
(00281AD8) Vcl::Controls::TWinControl::MainWndProc
(003C9C14) System::Classes::_18201
(00031331) USER32.dll
(000220E1) USER32.dll
(00021B65) USER32.dll
(0002BAAD) USER32.dll
(00077B5B) ntdll.dll.KiUserCallbackDispatcher
(00037A33) USER32.dll
(00020BC1) USER32.dll.SendMessageW
(001E5BC3) Vcl::Stdctrls::TCustomEdit::GetModified
(0040D6CC) System::Actions::TContainedActionList::UpdateAction
(001CF76E) Vcl::Actnlist::TCustomAction::Update
(002415D6) Vcl::Forms::_16777
(00241654) Vcl::Forms::TCustomForm::UpdateActions

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.