I read the specification in "5.3.3. SFID - Start File" that it should possible to set the record format for encrypted files. Why does Mendelson OFTP2 allow only unstructured? Or do I misread the specification?
SFIDFMT last sentence:
"SFID File Format Field in this scenario indicates the format of the original file, and the transmitted file must be treated as U format."
Handle it as U til it is decrypted. Then use the record format as it is set.
SFIDLRECL last paragraph:
"If SFIDFMT is ’V’ and the file is compressed, encrypted, or signed, then the maximum value of SFIDRECL is ’65536’."
This implies you can set record format to V for an encrypted file.