What is res0409.dll?

Res0409.dll is a Windows DLL file. DLL is the abbreviation for Dynamic Link Library. DLL files are needed by programs or web browser extensions, because they contain program code, data, and resources. The following information can help you determine if res0409.dll is a Windows system file or if it belongs to an application that you can trust.

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Res0409.dll file information

The process known as Ipswitch WS_FTP Pro/Home Resource DLL - English or Ipswitch WS_FTP Professional/Home Resource DLL - English or WS_FTP Upload Wizard Application belongs to software Ipswitch WS_FTP Pro or Ipswitch WS_FTP Professional (version 2007) or Ipswitch WS_FTP (version 12) by Ipswitch ( (version 10 Maguire Road - Suite 220 Lexington, MA 02421).

Description: Res0409.dll is not essential for the Windows OS and causes relatively few problems. The file res0409.dll is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 1,433,645 bytes (30% of all occurrences), 6,551,672 bytes and 4 more variants. 
A .dll file (Dynamic Link Library) is a special type of Windows program containing functions that other programs can call. This .dll file can be injected to all running processes and can change or manipulate their behavior. The program has no visible window. There is no detailed description of this service. It can change the behavior of other programs or manipulate other programs. The res0409.dll file is not a Windows system file. Therefore the technical security rating is 66% dangerous, however you should also read the user reviews.

Uninstalling this variant: If problems with Ipswitch WS_FTP 12 or Ipswitch WS_FTP Pro come up, you can uninstall the software using the Uninstall a Program function of Windows Control Panel (Windows: Start, Settings, Control Panel, Uninstall a Program) or ask the software vendor,, for advice.

Recommended: Identify res0409.dll related errors

Important: Some malware camouflages itself as res0409.dll, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the res0409.dll process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

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Summary: Average user rating of res0409.dll: based on 1 vote with 1 user comment. One user thinks res0409.dll is essential for Windows or an installed application.

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Best practices for resolving res0409 issues

A clean and tidy computer is the key requirement for avoiding problems with res0409. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the res0409.dll process on your computer, the following programs have proven to be helpful: Security Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

res0409.dll [all]