7 won't open 6.5.30

What gives! A couple of 6.5 gets the message " 7 can’t open projects recorded created in ver 6.5.30" or something to that effect.
BUT two other projects created in 6.5
Open fine. Surely this can’t be right.
Anyone seen this problem?
Same computer, same hard drive.
Never seen this problem ver 1.5 through 6.5.

Sorry folks someone moved it to here.

No one else ever seen this? Using Nu since 1.5 never seen this.