Hello, you have posted in the Anglophone forum. I suggest that you ask your question here on the French forum. Or ask your question in English and we would be happy to help.
If you are still looking to convert your important DBX files to Outlook PST file format then you can try the professional automated solution which is capable to recover any corruption in the DBX file and export multiple DBX file data to PST format and also capable to export to various other file formats like EML, MBOX, HTML, etc. There are manual techniques also available on the internet, but they also occur several limitations with these manual steps such as the process would be a more time-consuming and complex one.