Revert "Delete T3.sln"

This reverts commit e5cf4780c2a92c9306fc56c9f425fb9dec8ff130.
Revert "Revert "Delete T3.sln""

This reverts commit 7593fb9bf4ee8ff65f9f9b92d90390a497da796b.
Revert "Revert "Revert "Delete T3.sln"""

This reverts commit 6d949396d4526cef68c282a2ac19c2d2b97d6a3f.