| Attribute | Details | |-----------|---------| | | C:\Windows\System32\ (and C:\Windows\SysWOW64\ on 64-bit systems) | | Publisher | Microsoft Corporation | | File Size (Win10 64-bit) | Approximately 55–70 KB | | Typical CPU Usage | 0% (spikes briefly when called) | | Safety | Safe when located in System32; dangerous elsewhere |
rundll32.exe urlmon.dll,URLDownloadToFileA http://example.com/file.zip C:\temp\file.zip Rundll32.exe Download Windows 10
The System File Checker tool automatically replaces missing or corrupted system files like rundll32.exe with a healthy cached version. Type in the Windows search bar. Right-click Command Prompt and select Run as administrator . Type sfc /scannow and press Enter . | Attribute | Details | |-----------|---------| | |
Legitimate Rundll32.exe should not require outgoing internet access unless a specific program (like a game updater or Microsoft utility) is using it as a host. If Rundll32.exe requests firewall access without you running a known program, block it and run a malware scan. Type sfc /scannow and press Enter
Outdated drivers or missing Windows patches can cause DLL mismatches.
Before you attempt any fix, confirm whether the Rundll32.exe on your system is the real Microsoft version.