I am having the same issue with my brand new QB desktop pro 2023.  I have been opening letter templates from qb via word for years.  Suddenly does not open.  no error message at all.  Please tell me how to fix this issue.  I have spent more that $500 for this program and this feature should work.  Both qb and windows 10 pro 64 bit are up to date.  I am running mcafee total protection