Thank you for taking the necessary steps to address Error 6175.0 when attempting to open your company file, @Bruno2024. I am here to provide additional guidance since the issue continues.

If you have the full version of QuickBooks Desktop installed on your server: Please check all your workstations before proceeding to your server computer to adjust your hosting settings. To do so, follow the steps below: 

1. Open QuickBooks on your server computer.
2. Go to the File menu and hover over Utilities.
3. If Host Multi-User Access is available, select it. Then, repeat this step and choose Stop Hosting Multi-User Access to reset the multi-user mode.
4. Go through the process and choose Host Multi-User Access again.

If the full version of QuickBooks Desktop is not installed on your server, only the Database Server Manager is installed on your server computer. You can follow the steps to scan the folder containing your company file.

After checking the abovementioned and the issue persists, I recommend using QuickBooks File Doctor, a tool that refreshes your system files. 

Here's how: 

1. From the Tool Hub, select Company File Issues.
2. Choose Run QuickBooks File Doctor, which may take about a minute to open. If it doesn't open automatically, search for and manually open QuickBooks Desktop File Doc.
3. In the File Doctor, select your company file from the dropdown, or use Browse to locate your file if it's not listed.
4. Choose Check your file (only the middle option) and click Continue.
5. Enter your QuickBooks admin password and select Next.

For more detailed information, check out this article: How to fix Error 6175,0.

Additionally, you can visit this helpful resource and learn how to verify and rebuild your data in QuickBooks Desktop: Verify and Rebuild Data in QuickBooks Desktop

If you have further concerns about Error 6175.0, please don't hesitate to comment and I'll surely reply. Have a great day ahead!