Trying to decrypt files encrypted by Symantec Encryption Desktop - (3031:input does not contain PGP data)

Hello!

I am trying to decrypt some files which were encrypted by Symantec Encryption Desktop by utilizing PGP Command Line.

I have exported the private and public key in SED and imported it in PGP Coammand Line.

This is what I get when I try to decrypt:

pgp --decrypt --input "test.one" --passphrase "foobar"

Restult:

test.one:decrypt 3031:input does not contain PGP data

The file is encrpted and it does contain PGP data. I can even see it when I open the file in a text editor:

...PGP Netshare ...PGP ...

I also tried with --symmetric-passphrase instead - same result.

Any hints for me?

Thanks a lot in advance and best regards
Stephan