Start an external application via double-click

By default FreeFileSync opens the operating system's standard file browser on each double-click by invoking "explorer /select, %name" on Windows and "xdg-open %dir" on Linux.

However the user is free to integrate other external applications into FreeFileSync: navigate to "Menu -> Advanced -> Global settings: External Applications" and add or replace a command string. The first entry is used when double-clicking a row while all subsequent entries are only available in right-click context menu on main dialog. The following macros are available:

%name   - full file or directory name
%dir    - directory part only
%nameCo - Other side's counterpart to %name
%dirCo  - Other side's counterpart to %dir

Examples:

• Start visual difference tool:
  C:\Program Files\WinMerge\WinMergeU.exe "%name" "%nameCo"

• Show file in Windows Explorer:
  explorer /select, "%name"

• Open file in associated application:
  cmd /c start "" "%name"

• Open console dialog:
  cmd /k cd /D "%dir"

Note:
Don't forget to use quotation marks if file names contain spaces!