szTip
TCHAR
A null-terminated string that specifies the text for a standard tooltip. It can have a maximum of 64 characters, including the terminating null character.
For Windows 2000 and later, szTip can have a maximum of 128 characters, including the terminating null character.
So I think that we can consider a max length of 128 and not 64
OK, applied. TrayIcon was added a couple of years ago when we still needed to support Win98.... But I guess we can finally forget about pre-Win2K days...