An .asm file builds successfully in VS2019, even though I have not updated Build Customization for a masm target. How is this possible?

[Belloc]

This is the code:

.386
.MODEL flat, stdcall
.stack 4096

ExitProcess PROTO STDCALL, dwExitCode: DWORD

.CODE
main PROC
mov eax, -1
invoke ExitProcess, 0
main ENDP

END main

This the picture contained Build Customization



And this is the picture of `main.asm` property page:




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