What is MPAPI3s.exe?

The .exe extension on a filename indicates an executable file. Executable files may, in some cases, harm your computer. Therefore, please read below to decide for yourself whether the MPAPI3s.exe on your computer is a Trojan that you should remove, or whether it is a file belonging to the Windows operating system or to a trusted application.

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MPAPI3s.exe file information

Windows Task Manager with MPAPI3s
MPAPI3s.exe process in Windows Task Manager

The process known as Mobile Phone API belongs to software Nokia Connectivity Library by Nokia (

Description: MPAPI3s.exe is not essential for the Windows OS and causes relatively few problems. MPAPI3s.exe is located in a subfolder of "C:\Program Files\Common Files". Known file sizes on Windows 10/8/7/XP are 474,624 bytes (46% of all occurrences), 471,552 bytes, 470,016 bytes, 552,448 bytes or 457,216 bytes. 
The program is not visible. MPAPI3s.exe is not a Windows core file. The program can be removed using the Control Panel's Add\Remove programs applet. Therefore the technical security rating is 29% dangerous, however you should also read the user reviews.

Uninstalling this variant: The software vendor offers the option to do the following:
  1) uninstall the program using the Control Panel ⇒ Uninstall a ProgramNokia PC Suite
  2) contact to assist you
  3) check if there is a newer version available.

Recommended: Identify MPAPI3s.exe related errors

Important: Some malware camouflages itself as MPAPI3s.exe, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the MPAPI3s.exe 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

Is part of nokia phone conection manager
This file appeared in my Task Manager after Installing Nokia Phone Suite
I just installed Nokia Suite 6.5
when this exe runs it slows down my internet connection, I check with dsl speed testers with and without and it is really the problem. I usually kill th exe when I ma not synchronizing
  Adnan Doyuran  
i also installed my new Nokia n95 software, must be from that.
  Rob Csizmazia  
I agree it's part of Nokia PC Suite
I concur, it is part of nokia pc suite
Is a part of Nokia Pc Suite!
I just installed Nokia Suite 6.8
I only noticed it, but I installed Nokia software 6 weeks ago, and my com has been a lot slower recently and I had to reinstall Win.xp last week because my com wouldn't boot up
nokia connection
I't part o Nokia connection/sync software
  Lars Hoej  
Macht dass internet wesentlich lagsamer
Nokia PC Suite.. slows down my internet connection
another systemservice foisted by Nokia. After upgrading PCSuite there is a shitload of unwanted and not needed stuff runing once system. This definitley sucks. We do not want autostarting services without request and option to deny.
  Tyra Misoux  
nokia pc suite is unable to write in this file. how do i install nokia
  Ajay Kumar  

Rating chart

Summary: Average user rating of MPAPI3s.exe: based on 26 votes with 16 user comments. 16 users think MPAPI3s.exe is essential for Windows or an installed application. 2 users think it's probably harmless. 5 users think it's neither essential nor dangerous. 3 users suspect danger. 5 users don't grade MPAPI3s.exe ("not sure about it").

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Best practices for resolving MPAPI3s issues

A clean and tidy computer is the key requirement for avoiding problems with MPAPI3s. This means running a scan for malware, cleaning your hard drive using 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic 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 6resmon 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 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the MPAPI3s.exe process on your computer, the following programs have proven to be helpful: ASecurity 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. BMalwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

MPAPI3s.exe [all]