Hi Yahya Masalmah ,

Thank you for your message regarding the error "Unable to determine security privileges" when opening a company file. This issue often arises due to various factors, such as a user being in the Maintain, Company Information section, abnormal termination of Sage 50—U.S. Edition, a damaged company folder, issues with Pervasive, or attempting to open a company from an external media device.

To resolve this, please follow these steps:

1. External Media Device: If opening from an external drive, move the company to an internal hard drive and try again.
2. Close Company Information: Ensure the Company Information window is closed on all workstations.
3. Restart Actian Service: On the server, press Windows + R, type 'services.msc', and restart the Zenengine service. Then, check if you can access the company.
4. Reboot Computers: In a network environment, reboot all workstations and the server. Have one user log in first, followed by others.
5. Clean Company Folder: Refer to 'Create a clean data folder and expendable file cleanup'.
6. Reinstall Actian: Follow the guide for removing and reinstalling Actian.
7. Repair Program: Remove all but the individual company data folder, then run Repair on the program.
8. Restore a Backup: If all else fails, restore a backup into a new company.

If these steps don't resolve the issue, please let us know. We're here to assist further.

Warm Regards,
Erzsi