Hi Fabiano,
If you search for that file in the real attachments directory (example: site/attachments/default/knowledge/files/rep***/ you should see a file like this:
95E027EAEA02994493EC6E7A470BD5E8_400188_Passo%20a%20passo%20para%20compactação%20dos%20arquivos%20datafiles%20do%20backup%20online%20do%20sistema%20CYPRESS.pdf.gz
Does that have the correct Portuguese name ?
If so, can you check your SDM log for any entries like this:
12/03 12:19:40.98 SDMHOST 6200 SIGNIFICANT pdm_process.c 916 Stopped: C:/PROGRA~2/CA/SERVIC~1/bin/keit_daemon
12/03 12:19:41.50 SDMHOST 5520 ERROR daemon_obj.c 1924 Daemon keit_daemon died: restarting
I'm seeing that its related to the Length of the file name it needs to create and that its not related to the characters. I might be wrong. I could only recreate the issue in 12.7 but 14.1 it worked fine.
In 14.1, when the attachment was originally made, the file name was truncated appropriately in the real attachments directory (example: F554A68417142140B420EA8D1A8149C8_ctação dos arquivos datafiles do backup online do sistema CYPRESS.docx.gz as opposed to the full name as you saw earlier). So, export (with attachments) functioned fine with the same name.
What release did you see this issue in?
_R