Sometimes Windows system displays error messages regarding corrupted or missing ACEWSS.DLL files. Situations like that can occur, for example, during a software installation process. Each software program requires certain resources, libraries, and source data to work properly. Corrupted or nonexistent ACEWSS.DLL file can therefore effect in failed execution of the started process.

ACEWSS.DLL file Microsoft Access database engine SharePoint ISAM. The file was developed by for use with software. Here you will find detailed information about the file and instructions how to proceed in the event of ACEWSS.DLL related errors on your device. You can also download ACEWSS.DLL file compatible with Windows 10, Windows 7, Windows Vista, Windows 8 devices which will (most probably) allow you to solve the problem.

For Windows Compatible with: Windows 10, Windows 7, Windows Vista, Windows 8

File info

General information
File extension DLL
Description Microsoft Access database engine SharePoint ISAM
Program Microsoft Office System 2007
Author Microsoft Corporation
MIME type application/octet-stream
File type Dynamic link library
System Windows NT 32-bit
Copyrights © Microsoft Corporation. All rights reserved.
Character set Unicode
Language cod Neutral

There are various types of errors related to ACEWSS.DLL file. ACEWSS.DLL file may be located in wrong file directory on your device, may not be present in the system, or may be infected with malicious software and therefore not work correctly. Below is a list of most common error messages related to ACEWSS.DLL file. If you encounter one listed below (or similar), please consider the following suggestions.

  • ACEWSS.DLL is corrupted
  • ACEWSS.DLL cannot be located
  • Runtime Error - ACEWSS.DLL
  • ACEWSS.DLL file error
  • ACEWSS.DLL file cannot be loaded. Module was not found
  • cannot register ACEWSS.DLL file:
  • ACEWSS.DLL file could not be loaded
  • ACEWSS.DLL file doesn't exist



Application could not be started because ACEWSS.DLL file is missing. Reinstall the application to solve the problem.


Problems related to ACEWSS.DLL can be addressed in various ways. Some methods are meant only for advanced users. If you don't have confidence in your skills, we suggest consulting a specialist. Fixing ACEWSS.DLL file errors should be approached with utmost caution for any mistakes can result in unstable or unproperly working system. If you have the necassary skills, please proceed.

ACEWSS.DLL file errors can be caused by various factors, so its is beneficial to try to fix them using various methods.

Step 1: Scan your computer for any malicious software

Virus Scan

Windows files are commonly attacked by malicious software that prevents them from working properly. First step in addressing problems with ACEWSS.DLL file or any other Windows system files should be scanning the system for malicious software using an antivirus tool.

If by any chance you don't have any antivirus software installed on your system yet, you should do it immediately. Unprotected system is not only a source of file errors, but, more importantly, makes your system vulnerable to many dangers. If you don't know which antivirus tool to choose, consult this Wikipedia article – comparison of antivirus software.

Step 2: Update your system and drivers.

Windows Update

Installing relevant Microsoft Windows patches and updates may solve your problems related to ACEWSS.DLL file. Use dedicated Windows tool to perform the update.

  1. Go to the Windows "Start" menu
  2. Type "Windows Update" in the search field
  3. Choose the appropriate software program (name may vary depending on your system version)
  4. Check if your system is up to date. If any unapplied updates are listed, install them immediately.
  5. After the update has been done,restart your computer in order to complete the process.

Beside updating the system, it is recommended that you install latest device drivers, as drivers can influence proper working of ACEWSS.DLL or other system files. In order to do so, go to your computer or device producer's website where you will find information regarding latest driver updates.

Step 3: Use System File Checker (SFC) tool

System File Checker

System File Checker is a Microsoft Windows tool. As the name suggests, the tool is used for identyfing and addressing system file related errors, including those related to ACEWSS.DLL file. After an error related to%fileextension% file has been discovered, the program attempts to automatically replace the ACEWSS.DLL file with properly working version. To use the tool:

  1. Go to the Windows "Start" menu
  2. Type "cmd" in the search field
  3. Locate "Command Prompt" result – don't run it yet:
  4. Click the right mouse button and select "Run as Administrator" option
  5. Type "sfc /scannow" in console prompt to start the program and follow the instructions

Step 4: Restoring Windows system

Windows Recovery

Another approach is to restore system to previous state, before the ACEWSS.DLL file error occured. In order to restore your system, follow the instructions below

  1. Go to the Windows "Start" menu
  2. Type "System Restore" in the search field
  3. Start the system restore tool – it's name may differ depending on version of the system
  4. The application will guide you through the process – read the messages carefully
  5. After the process has finished, restart your computer.

If all the above-mentioned methods failed and the ACEWSS.DLL file problem has not been resolved, proceed to the next step. Remember that the following steps are intended only for advanced users.

Download and replace ACEWSS.DLL file

The last solution is to manually download and replace ACEWSS.DLL file in appropriate folder on the disk. Select file version compatible with your operating system and click the "Download" button. Next, go to your web browser's "Downloaded" folder and copy the downloaded ACEWSS.DLL file.

Go to the folder where the file should be located and paste the downloaded file. Below is the list of ACEWSS.DLL file example directory paths.

  • Windows 10: C:\Program Files\Common Files\microsoft shared\OFFICE15\
  • Windows 7: C:\Program Files (x86)\Common Files\microsoft shared\OFFICE14\
  • Windows Vista: ---
  • Windows 8: ---

If the steps did not solve your ACEWSS.DLL file problem, you should consult a professional. A probability exists that the error(s) might be device-related and therefore should be resolved at the hardware level. A fresh operating system installation might be necessary – a faulty system installation process can result in data loss.

File versions list

System Windows 10
File size 247016 bytes
Date 2017-05-10
File details
MD5 391949030ef2b41a3590e295c1bc5ded
SHA1 a470a52d068cdb5bb9fb9c82ac514a952e545e46
SHA256 f475cc215290d85e14dadbf5354938ef5e103d6bbd92b5658762260c189e47bf
CRC32 65b18301
Example file location C:\Program Files\Common Files\microsoft shared\OFFICE15\
System Windows 7
File size 247200 bytes
Date 2017-05-10
File details
MD5 46e1287e6aeb1b91858c9c9e279c90a0
SHA1 a852ea4c315700c7dce8a61b3788783943df0f7b
SHA256 0efc91f0291f94dd140a59a79b81184bf9577beb009851c9ec101a49ce89590a
CRC32 1139ccf1
Example file location C:\Program Files (x86)\Common Files\microsoft shared\OFFICE14\
System Windows Vista
File size 208760 bytes
Date 2017-05-10
File details
MD5 0da8e67502a8809b64c384cb9d170f2d
SHA1 7be6a0da929e2eeece75aaf33c2ae6bd85419fc3
SHA256 e39dc4aa6d4c59fe6aafb2b776e97c7f64acc1205ee823f598216e6b1764c2eb
CRC32 6ca6da1c
Example file location ---
System Windows 8
File size 247016 bytes
Date 2017-05-10
File details
MD5 391949030ef2b41a3590e295c1bc5ded
SHA1 a470a52d068cdb5bb9fb9c82ac514a952e545e46
SHA256 f475cc215290d85e14dadbf5354938ef5e103d6bbd92b5658762260c189e47bf
CRC32 65b18301
Example file location ---