By default FreeFileSync opens the operating system's file browser on each mouse double-click by invoking "explorer /select, "%item_path%"" on Windows and "xdg-open "%item_folder%"" on Linux.
However you may integrate other external applications into FreeFileSync: navigate to Menu → Advanced → Global settings: External Applications and add or replace a command. The first entry is executed when double-clicking a row or pressing ENTER on main grid while all other entries can only be accessed via the context menu shown after a right-click. The following internal macros are available:
%item_path% -
full file or folder
name
%item_folder% - folder
part only
%item2_path% -
Counterpart of %item_path% on the
opposite grid
%item2_folder% - Counterpart
of %item_folder% on the opposite grid
Examples:
Start
visual difference tool:
"C:\Program
Files\WinMerge\WinMergeU.exe" "%item_path%"
"%item2_path%"
Show
file in Windows Explorer:
explorer
/select, "%item_path%"
Open
file in associated application:
cmd
/c start "" "%item_path%" or
simply "%item_path%"
Open
console dialog:
cmd /k cd /D
"%item_folder%"
Note
Don't forget to use
quotation marks if file names contain spaces!