When an org buffer coding system is "utf-8-with-signature-unix" (the first 3 bytes in file are 0xEF 0xBB 0xBF), export to ODT gives following LibreOffice error when opening the exported file : "The file 'test.odt' is corrupt and therefore cannot be opened. LibreOffice can try to repair the file. [etc...]". If we set the encoding to "utf-8-unix" (no BOM), export is correct, and LibreOffice does not complain. To reproduce: Create a minimal org buffer, change the coding system (set-buffer-file-coding-system) to "utf-8-with-signature-unix", then export to ODT (C-c C-e o o), and open the generated odt file with LibreOffice. Note: Export to different formats (html, PDF, LaTeX) look correct. Versions: System: Xubuntu 20.04.1 LTS (focal) Emacs: 27.1 Org: 9.4 LibreOffice: 6.4 Regards, br. Attachement: test.org, a faulty org file (with Byte Order Mark). $ file test.org test.org: UTF-8 Unicode (with BOM) text ------------------------------------------------------------------------ Emacs : GNU Emacs 27.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 2.24.32) of 2020-10-29 Package: Org mode version 9.4 (9.4-29-g20374f-elpaplus @ /home/br/.emacs.d/elpa/org-plus-contrib-20201102/) current state: ============== (setq org-src-mode-hook '(org-src-babel-configure-edit-buffer org-src-mode-configure-edit-buffer) org-link-shell-confirm-function 'yes-or-no-p org-babel-after-execute-hook '(org-redisplay-inline-images) org-metadown-hook '(org-babel-pop-to-session-maybe) org-clock-out-hook '(org-clock-remove-empty-clock-drawer) org-html-format-inlinetask-function 'org-html-format-inlinetask-default-function org-odt-format-headline-function 'org-odt-format-headline-default-function org-ascii-format-inlinetask-function 'org-ascii-format-inlinetask-default org-startup-folded 'content org-mode-hook '(my/org-mode-hook org-tempo-setup #[0 "\300\301\302\303\304$\207" [add-hook change-major-mode-hook org-show-all append local] 5] #[0 "\300\301\302\303\304$\207" [add-hook change-major-mode-hook org-babel-show-result-all append local] 5] org-babel-result-hide-spec org-babel-hide-all-hashes #[0 "\301\211.\207" [imenu-create-index-function org-imenu-get-tree] 2] org-eldoc-load) org-odt-format-drawer-function #[514 "\207" [] 3 "\n\n(fn NAME CONTENTS)"] org-archive-hook '(org-attach-archive-delete-maybe) org-confirm-elisp-link-function 'yes-or-no-p org-agenda-before-write-hook '(org-agenda-add-entry-text) org-metaup-hook '(org-babel-load-in-session-maybe) org-bibtex-headline-format-function #[257 "\300.\236A\207" [:title] 3 "\n\n(fn ENTRY)"] org-latex-format-drawer-function #[514 "\207" [] 3 "\n\n(fn _ CONTENTS)"] org-babel-pre-tangle-hook '(save-buffer) org-tab-first-hook '(org-babel-hide-result-toggle-maybe org-babel-header-arg-expand) org-babel-load-languages '((calc . t) (emacs-lisp . t) (sql . t) (perl . t) (shell . t)) org-html-text-markup-alist '((verbatim . "%s") (verbatim . "%s") (verbatim . "%s") (verbatim . "%s") (verbatim . "%s") (verbatim . "%s") (bold . "%s") (code . "%s") (italic . "%s") (strike-through . "%s") (underline . "%s") (verbatim . "%s")) org-ascii-format-drawer-function #[771 ".\207" [] 4 "\n\n(fn NAME CONTENTS WIDTH)"] org-agenda-loop-over-headlines-in-active-region nil org-src-lang-modes '(("arduino" . arduino) ("browser" . html) ("redis" . redis) ("php" . php) ("C" . c) ("C++" . c++) ("asymptote" . asy) ("bash" . sh) ("beamer" . latex) ("calc" . fundamental) ("cpp" . c++) ("ditaa" . artist) ("dot" . fundamental) ("elisp" . emacs-lisp) ("ocaml" . tuareg) ("screen" . shell-script) ("shell" . sh) ("sqlite" . sql)) org-src-preserve-indentation t org-occur-hook '(org-first-headline-recenter) org-cycle-hook '(org-cycle-hide-archived-subtrees org-cycle-hide-drawers org-cycle-show-empty-lines org-optimize-window-after-visibility-change) org-todo-keywords '((sequence "TODO" "STARTED" "WAITING" "|" "DONE" "CANCELED")) org-support-shift-select t org-speed-command-hook '(org-speed-command-activate org-babel-speed-command-activate) org-odt-format-inlinetask-function 'org-odt-format-inlinetask-default-function org-babel-tangle-lang-exts '(("perl" . "pl") ("emacs-lisp" . "el") ("elisp" . "el")) org-export-before-parsing-hook '(org-attach-expand-links) org-confirm-shell-link-function 'yes-or-no-p org-link-parameters '(("attachment" :follow org-attach-follow :complete org-attach-complete-link) ("id" :follow org-id-open) ("eww" :follow org-eww-open :store org-eww-store-link) ("rmail" :follow org-rmail-open :store org-rmail-store-link) ("mhe" :follow org-mhe-open :store org-mhe-store-link) ("irc" :follow org-irc-visit :store org-irc-store-link :export org-irc-export) ("info" :follow org-info-open :export org-info-export :store org-info-store-link) ("gnus" :follow org-gnus-open :store org-gnus-store-link) ("docview" :follow org-docview-open :export org-docview-export :store org-docview-store-link) ("bibtex" :follow org-bibtex-open :store org-bibtex-store-link) ("bbdb" :follow org-bbdb-open :export org-bbdb-export :complete org-bbdb-complete-link :store org-bbdb-store-link) ("w3m" :store org-w3m-store-link) ("file+sys") ("file+emacs") ("shell" :follow org-link--open-shell) ("news" :follow #[514 "\301\300\302.Q.\"\207" ["news" browse-url ":"] 6 "\n\n(fn URL ARG)"] ) ("mailto" :follow #[514 "\301\300\302.Q.\"\207" ["mailto" browse-url ":"] 6 "\n\n(fn URL ARG)"] ) ("https" :follow #[514 "\301\300\302.Q.\"\207" ["https" browse-url ":"] 6 "\n\n(fn URL ARG)"] ) ("http" :follow #[514 "\301\300\302.Q.\"\207" ["http" browse-url ":"] 6 "\n\n(fn URL ARG)"] ) ("ftp" :follow #[514 "\301\300\302.Q.\"\207" ["ftp" browse-url ":"] 6 "\n\n(fn URL ARG)"] ) ("help" :follow org-link--open-help) ("file" :complete org-link-complete-file) ("elisp" :follow org-link--open-elisp) ("doi" :follow org-link--open-doi)) org-latex-format-headline-function 'org-latex-format-headline-default-function org-export-allow-bind-keywords t org-link-elisp-confirm-function 'yes-or-no-p org-latex-format-inlinetask-function 'org-latex-format-inlinetask-default-function org-tab-before-tab-emulation-hook '(org-tempo-complete-tag) org-html-format-drawer-function #[514 "\207" [] 3 "\n\n(fn NAME CONTENTS)"] org-html-format-headline-function 'org-html-format-headline-default-function org-src-window-setup 'current-window org-indent-mode-turns-on-hiding-stars nil org-link-from-user-regexp "\\\\|\\" org-publish-project-alist '(("org" :base-directory "~/org" :base-extension "org" :publishing-directory "~/dev/www/cf.bodi/org" :recursive t :publishing-function org-html-publish-to-html :html-head-include-default-style nil :html-head-include-scripts nil) ("static" :base-directory "~/org/" :base-extension "css\\|js\\|png\\|jpg\\|gif\\|pdf\\|mp3\\|ogg\\|swf" :publishing-directory "~/dev/www/cf.bodi/org/" :recursive t :publishing-function org-publish-attachment) ) )