How can I decrypt the contents of the data.fm file (base64 is not suitable)?

Question

Encryption

They sent me a file, the content of which is very similar to the base64 encoding, but is not decrypted (only kryakozyabry). Help decrypt the contents of the file and tell me, please, what software can be used for this. The code itself from the file can be obtained with a regular notepad, or Notepad ++. I opened it with Adobe FrameMaker. *.fm file format like it. But only the same code is visible. Help to recognize the encoding, masters!
The file itself: https://yadi.sk/d/YfJex2Dwq-gPuw

Answer 1

It's base64, just squashed to base64:

> base64 -d data.fm >data.z
> openssl zlib -d -in data.z > data.txt

https://pastebin.com/gXhump0Z
(there are null bytes, I think they got lost when pasting)