All tad windows closed after error in only one of them

[mindoo]

1. Open file in tad
2. Open new tad window
3. In the new window, try opening file that is e.g. already opened in excel -> you get an error
4. After pressing "OK" on the error - all tad windows are closed

Expected behavior : Only the window with error is closed.

Even better: Implement a "Retry" functionality, so I can close excel and retry opening in tad