Recovered file problem- may be 32 v. 64 bit caused

Two months ago, my Win 7 32 bit machine had a CPU failure.
I got a new machine, used my old HDs, installed Win 8.1 64 bit o/s.
I wasn't careful enough and I did the re-partition re-format operations over a few files that I should have set aside.
But, I was able to recover them and the recovery program said they were in excellent condition, no clusters over-written.
However, when I try to run them, I get a "this app can't run on your pc" message. I tried running it from the a command prompt, and it said "the program or feature \\??c:\m.exe cannot start or run due to incompatibility with 64-bit versions windows.

The problem is, this is an encrypted (fsekrit) text file that I need to open. It's not just some app that I can buy a new 64 bit version of and go from there.

Any solutions come to mind?

For help with third party programs it is often best to go to the supplier:
f0dder's fSekrit

How about if you decrypted the file(s) on a 32bit system and then used it as plain text file on the 64bit system.