WinSCP hangs when opening big binary file

When I press Enter, WinSCP opens currently selected file in internal viewer. When I do this mistakenly when cursor was on some big (e.g. 7MB) binary file, it takes ages for WinSCP to display its contents. In such case I usually kill it and start it again. Please fix this.

WinSCP 5.7.3 build 5483, Win 7 Pro SP1

Have a look at this setting:
https://winscp.net/eng/docs/ui_pref_panels#double-click

Make sure double-click operation is set to "copy", and using SFTP you will be able to press Cancel on the transfer before it actually tries to open the file.

Also, WinSCP will warn on opening huge files larger than 500MB. 7MB is not actually considered "big" these days ;)