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Why Did OneDrive Put DLL Files on My Desktop? Causes and Fixes
Question details
The user is finding unexpected DLL files appearing on their desktop and wants to know why OneDrive placed them there and how to properly handle or remove them.
- Product
- Microsoft OneDrive
- Device & OS
- not provided
- Scenario
- Synchronizing files with OneDrive and noticing unknown system or application files cluttering the desktop.
- Observed behavior
- DLL files are appearing on the desktop, likely synchronized by OneDrive from another connected device or inadvertently created by an installed application.
Do not immediately permanently delete the DLL files, as they might be required for certain applications to function properly. Create a temporary folder on your desktop to move them into while you investigate their origin.
Identify and Safely Remove Unnecessary DLL Files
Determine which application or device is syncing the DLL files to your desktop before safely moving them to the Recycle Bin.
OneDrive itself does not generate DLL files on the desktop. These files are typically extracted by software installers, created by poorly configured applications, or synced from another computer sharing the same OneDrive account.
Right-click the unexpected DLL file on your desktop, select 'Properties', and navigate to the 'Details' tab to see the product name and which software it belongs to.
Click the OneDrive cloud icon in your system tray, then click on 'Settings' (gear icon) or simply view the main activity feed to see if the files were recently synced from another device.
If you confirm the files are unnecessary or belong to a portable app you no longer use, select the DLL files and press the Delete key to move them to the Recycle Bin.
If you are unsure whether the files are safe to delete, take a screenshot of the files and seek advice on a technical forum. Be sure to specify whether you are using OneDrive Personal or OneDrive for Business.
Stop OneDrive from Syncing the Desktop Folder
If you don't want desktop files (including unwanted app system files) syncing across all your devices, you can turn off Desktop backup in your OneDrive settings.
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Frequently Asked Questions
Can I just permanently delete the DLL files on my desktop?
It is not recommended to permanently delete them immediately using Shift+Delete. First, check their properties to see which application created them. If they are critical for an app, deleting them might break the software. Move them to the Recycle Bin temporarily to test if your applications still run correctly.
Why does OneDrive sync system files like DLLs?
OneDrive automatically syncs all files located in the folders you have selected for backup, such as Desktop, Documents, or Pictures. If an application inadvertently extracts or saves DLL files directly onto your desktop, OneDrive treats them like any other file and syncs them to the cloud.
How do I know if the DLL files came from another computer?
Open the OneDrive application from your taskbar and view the 'Sync history' or activity pane. It will display a chronological list of recently added files and often indicate if they were downloaded from the cloud due to a sync initiated by a different device logged into your account.
Are unexpected DLL files on the desktop dangerous?
Not inherently, but their placement is highly unusual. While they are usually just poorly handled application extensions misplaced during software installation or unzipping, some malware can disguise itself as a DLL file. It is a good practice to run a quick antivirus scan on the unexpected files to ensure your system is secure.
