What is Asapi?

Asapi.sys is a Windows driver. A driver is a small software program that allows your computer to communicate with hardware or connected devices. This means that a driver has direct access to the internals of the operating system, hardware etc. The free file information forum can help you determine if Asapi.sys is a Windows system file or if it belongs to an application that you can trust.

Run a free scan to check for Asapi drivers in need of updating

Asapi.sys file information

The process known as ASAPI belongs to software asapi or WaveLab by VOB Computersysteme GmbH (

Description: Asapi.sys is not essential for Windows and will often cause problems. The Asapi.sys file is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 11,264 bytes (51% of all occurrences) or 10,240 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The Asapi.sys file is a file with no information about its developer. The program has no visible window. There is no detailed description of this service. Asapi.sys is not a Windows core file. Asapi.sys appears to be a compressed file. Therefore the technical security rating is 43% dangerous, however you should also read the user reviews.

Uninstalling this variant: If you want to remove the program completely, go to Control Panel ⇒ Software ⇒ WaveLab.

Recommended: Identify Asapi.sys related errors

Important: Some malware disguises itself as Asapi.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the Asapi.sys 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

Charakteristik: Die Datei Asapi.sys befindet sich im Ordner C:\Windows\System32\drivers. Bekannte Dateigrößen unter Windows XP sind 11264 bytes (77% aller Vorkommen), 10240 bytes, 8768 bytes.
CD-ROM drivers produced by VOB Computersysteme GmbH. They replace ASPI drivers. The VOB ASAPI layer is an advanced ASPI programming interface. Both IDE and SCSI devices can be used. It is supposed to be 10-15% quicker than normal ASPI layers. ASPI is produced by Adaptec.
  Rob Stuart  
This file is linked on the Hydrogen Audio website for use with CD audio ripping programs in lieu of Adaptec's ASPI driver
  Roger Dennis   (further information)
I know when I updated it through WaveLab it fixed the problems I was having with my DVD/RW drive's ability to copy CDs in raw mode.

Rating chart

Summary: Average user rating of Asapi.sys: based on 6 votes with 4 user comments. 3 users think Asapi.sys is essential for Windows or an installed application. One user thinks it's neither essential nor dangerous. 2 users suspect danger.

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Best practices for resolving Asapi issues

A clean and tidy computer is the key requirement for avoiding problems with Asapi. 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 Asapi.sys 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

Asapi.sys [all]