Password protect files either on deesktop or onedrive

For files on the desktop or in regular OneDrive folders, Windows does not provide a simple built-in way to add a separate password to a file or folder without using protection features such as encryption or app-specific password protection.

Available built-in options from the provided context:

1. Use OneDrive Personal Vault for sensitive files stored in OneDrive.
   Personal Vault is a protected area in OneDrive that requires a strong authentication method or a second step of identity verification such as fingerprint, face, PIN, or a code by email or SMS. To use it:
   1. In OneDrive, select the Personal Vault folder.
   2. Verify identity using the offered method.
   3. Move sensitive files into Personal Vault.
   4. When finished, select Lock to lock it manually, or let it auto-lock after inactivity.
2. Password-protect specific Microsoft Project files if that is the file type involved.
   In Project:
   1. Select File > Save As.
   2. Choose a location and select Browse.
   3. In Save As, select Tools > General Options.
   4. Add either a Protection password to open the file or a Write-reservation password to allow read-only access unless the password is entered.
   5. Confirm the password and save.
3. Strengthen account protection for OneDrive access.
   Add security info to the Microsoft account and use two-step verification. Personal Vault specifically requires additional verification each time it is accessed.

If the goal is to protect general files on the desktop or ordinary folders with a pop-up password, that is not described as a built-in Windows feature in the provided material.

• Protect your OneDrive files in Personal Vault
• Protect your OneDrive files in Personal Vault
• Protect your OneDrive files in Personal Vault
• Password-protect a project file
• How OneDrive safeguards your data in the cloud
• How OneDrive safeguards your data in the cloud
• How to require a password to access a file or folder - Microsoft Q&A