Try as I mught I cannot see anyone in the elevator, and I guess this is why the files won't open? I have been to the motel, been to the shed, already read the new email and solved the cryptogram, been back to the shed, etc. But I never do catch Fortney in the office. Have I missed a trigger ot something? Thanks!

Have you finished everything at the motel?
Have you been to the shed?
On the way to the office - a cutscene of Fortrey entering the elevator and leaving.
Check the wt and see if you missed doing anything.
If not, continue on and check the computer and Johnson's office. If you found all the things needed to be seen there, then I think you're safe.

I DID miss something- it was under the bed !

AHA! The letters - great - now onwards. Have fun!