Preferred external xhtml editor field cleared prematurely

I apologize in advance if this is nonsense ...

My editor preference is set for: C:/Program Files/PageEdit/PageEdit.exe.

Edit -> Preferences and click on the Browse button.
Click Cancel on the Windows Browser window.
Voilà: the field has been cleared.

It seems to me that the field should not have been cleared. Am I missing something?

Thanks.

Windows 10, Sigil v2.3.0