I've done it, but don't save anything. When I close TCUP all changes have missed.
Anyway, if TCUP is based on TC, when I change the columns width (i.e. Name column or Ext column) and/or open a new tab, when I close TC and open again it preserves this changes. Perhaps something doesn't work fine on Vista with TCUP? Write permissions, perhaps? ... (My account is an administrator account).
For example, I've changed permissions on wincmd.ini file. All users can modify this file and now my new tabs are saved correctly, but not columns width. Then ...?
Anyway, if TCUP is based on TC, when I change the columns width (i.e. Name column or Ext column) and/or open a new tab, when I close TC and open again it preserves this changes. Perhaps something doesn't work fine on Vista with TCUP? Write permissions, perhaps? ... (My account is an administrator account).
For example, I've changed permissions on wincmd.ini file. All users can modify this file and now my new tabs are saved correctly, but not columns width. Then ...?

