Bug 154747

Description:
when I try to save and encrypt the spreadsheet using xlsx format I get a "write error" message box (with nothing useful to know the error)

saving in ods + gpg encryption format works (but produce unexpected result see information below).

suspecting similar issue on other documents (writer...) when using microsoft format

Steps to Reproduce:
1.open a spreadsheet
2.file->save as
3.choose xlsx file format
4.check "encrypt with gpg key"

Actual Results:
1.the key chooser is displayed 
2.when saving a error message box is displayed "write error, the file could not be written"

Expected Results:
a binary encrypted file


Reproducible: Always


User Profile Reset: No

Additional Info:
seems that when saving ods+gpg file the content is encrypted but the container remain a zip
for compatibility with ms office, which I think don't support "in archive pgp file encryption", I would have expected to have the file be the result of "gpg -e file" and have a file type of "PGP/MIME-encrypted message header"

same for ODS file by the way... this could even create "dual encryption" : the "save with password" option act as described by https://support.microsoft.com/en-us/office/protect-a-document-with-a-password-05084cc3-300d-4c1a-8416-38d3e37d6826 

and GPG encryption should encrypt the result file as if it was an email attachement.

so, when opening a file with a xlsx or ods extension, if the file type is "PGP/MIME-encrypted message header" the gpg key is prompted, then the file decifered, the result is opened as a regular file (so password is prompted if file is password protected...) 

on saving, the file is saved as the requested format, applying password protection if requested, then piped to gpg to encrypt the result