Steps to reproduce:
0) (optional) set PSPad as external viewer/editor.
1) log in to any server, so you get the main window in NC-style interface.
2) right click any local file: the 1st, bold (thus default) menu item is Open. Clicking this opens the associated program - this is OK.
3) double click the same local file, or press Enter while it is selected.
Expected behavior: file is open in associated program.
Actual behavior: file is open in PSPad.
Rationale: double-clicking or pressing enter on a selected file usually produces the same result as invoking the default (bold) popup menu item.
WinSCP version: 4.2.9 (build 938)
Windows 7 64bit