Question:

How to enable dialog window when the FlexiCapture.exe is started if for some reason it was disabled on the previous run?

Answer:

This option could be enabled again in the registry configuration for the current user by the following path \HKEY_CURRENT_USER\Software\ABBYY\FlexiCapture\12.0\Shell\StartUp

Edit the registry key ShowSelectModeDialog. There are two possible values:

1. False for not showing the Mode Dialog; 
2. True to show the Mode Dialog every time the FlexiCapture.exe is started.