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Error: Code 9504 - The file '|' is not readable by the Access database engine. @If you think you have a valid Access database, this is most likely because of the recent file format change. Do you want to attempt to upgrade the database format?@@19@@@2.


How to fix the Runtime Code 9504 The file '|' is not readable by the Access database engine

This article features error number Code 9504, commonly known as The file '|' is not readable by the Access database engine described as The file '|' is not readable by the Access database engine. @If you think you have a valid Access database, this is most likely because of the recent file format change. Do you want to attempt to upgrade the database format?@@19@@@2.


About Runtime Code 9504

Runtime Code 9504 happens when Microsoft Access fails or crashes whilst it's running, hence its name. It doesn't necessarily mean that the code was corrupt in some way, but just that it did not work during its run-time. This kind of error will appear as an annoying notification on your screen unless handled and corrected. Here are symptoms, causes and ways to troubleshoot the problem.


Definitions (Beta)

Here we list some definitions for the words contained in your error, in an attempt to help you understand your problem. This is a work in progress, so sometimes we might define the word incorrectly, so feel free to skip this section!

  • Access - DO NOT USE this tag for Microsoft Access, use [ms-access] instead
  • Database - A database is an organized collection of data
  • File - A block of arbitrary information, or resource for storing information, accessible by the string-based name or path
  • File format - A file format is a particular way that information is encoded for storage in a computer file.
  • Format - It may refer to text formatting, content format, file format, document file format, etc.
  • Upgrade - This tag refers to the process of replacing a particular system with a newer version of the same system
  • Access - Microsoft Access, also known as Microsoft Office Access, is a database management system from Microsoft that commonly combines the relational Microsoft JetACE Database Engine with a graphical user interface and software-development tools

Symptoms of Code 9504 - The file '|' is not readable by the Access database engine

Runtime errors happen without warning. The error message can come up the screen anytime Microsoft Access is run. In fact, the error message or some other dialogue box can come up again and again if not addressed early on.

There may be instances of files deletion or new files appearing. Though this symptom is largely due to virus infection, it can be attributed as a symptom for runtime error, as virus infection is one of the causes for runtime error. User may also experience a sudden drop in internet connection speed, yet again, this is not always the case.


Fix The file '|' is not readable by the Access database engine (Error Code 9504)
(For illustrative purposes only)



Causes of The file '|' is not readable by the Access database engine - Code 9504

During software design, programmers code anticipating the occurrence of errors. However, there are no perfect designs, as errors can be expected even with the best program design. Glitches can happen during runtime if a certain error is not experienced and addressed during design and testing.

Runtime errors are generally caused by incompatible programs running at the same time. It may also occur because of memory problem, a bad graphics driver or virus infection. Whatever the case may be, the problem must be resolved immediately to avoid further problems. Here are ways to remedy the error.


Repair Methods

Runtime errors may be annoying and persistent, but it is not totally hopeless, repairs are available. Here are ways to do it.

If a repair method works for you, please click the upvote button to the left of the answer, this will let other users know which repair method is currently working the best.

Please note: Neither ErrorVault.com nor it's writers claim responsibility for the results of the actions taken from employing any of the repair methods listed on this page - you complete these steps at your own risk.

When you get a runtime error, keep in mind that it is happening due to programs that are conflicting with each other. The first thing you can do to resolve the problem is to stop these conflicting programs.
  • Open Task Manager by clicking Ctrl-Alt-Del at the same time. This will let you see the list of programs currently running.
  • Go to the Processes tab and stop the programs one by one by highlighting each program and clicking the End Process buttom.
  • You will need to observe if the error message will reoccur each time you stop a process.
  • Once you get to identify which program is causing the error, you may go ahead with the next troubleshooting step, reinstalling the application.
Using Control Panel
  • For Windows 7, click the Start Button, then click Control panel, then Uninstall a program
  • For Windows 8, click the Start Button, then scroll down and click More Settings, then click Control panel > Uninstall a program.
  • For Windows 10, just type Control Panel on the search box and click the result, then click Uninstall a program
  • Once inside Programs and Features, click the problem program and click Update or Uninstall.
  • If you chose to update, then you will just need to follow the prompt to complete the process, however if you chose to Uninstall, you will follow the prompt to uninstall and then re-download or use the application's installation disk to reinstall the program.
Using Other Methods
  • For Windows 7, you may find the list of all installed programs when you click Start and scroll your mouse over the list that appear on the tab. You may see on that list utility for uninstalling the program. You may go ahead and uninstall using utilities available in this tab.
  • For Windows 10, you may click Start, then Settings, then choose Apps.
  • Scroll down to see the list of Apps and features installed in your computer.
  • Click the Program which is causing the runtime error, then you may choose to uninstall or click Advanced options to reset the application.
Virus infection causing runtime error on your computer must immediately be prevented, quarantined or deleted. Make sure you update your virus program and run a thorough scan of the computer or, run Windows update so you can get the latest virus definition and fix.
You might be getting the error because of an update, like the MS Visual C++ package which might not be installed properly or completely. What you can do then is to uninstall the current package and install a fresh copy.
  • Uninstall the package by going to Programs and Features, find and highlight the Microsoft Visual C++ Redistributable Package.
  • Click Uninstall on top of the list, and when it is done, reboot your computer.
  • Download the latest redistributable package from Microsoft then install it.
You might also be experiencing runtime error because of a very low free space on your computer.
  • You should consider backing up your files and freeing up space on your hard drive
  • You can also clear your cache and reboot your computer
  • You can also run Disk Cleanup, open your explorer window and right click your main directory (this is usually C: )
  • Click Properties and then click Disk Cleanup
If the error is related to a bad graphics driver, then you may do the following:
  • Open your Device Manager, locate the graphics driver
  • Right click the video card driver then click uninstall, then restart your computer
If the error you are getting is related to the Internet Explorer, you may do the following:
  1. Reset your browser.
    • For Windows 7, you may click Start, go to Control Panel, then click Internet Options on the left side. Then you can click Advanced tab then click the Reset button.
    • For Windows 8 and 10, you may click search and type Internet Options, then go to Advanced tab and click Reset.
  2. Disable script debugging and error notifications.
    • On the same Internet Options window, you may go to Advanced tab and look for Disable script debugging
    • Put a check mark on the radio button
    • At the same time, uncheck the "Display a Notification about every Script Error" item and then click Apply and OK, then reboot your computer.
If these quick fixes do not work, you can always backup files and run repair reinstall on your computer. However, you can do that later when the solutions listed here did not do the job.
Other languages:

Wie beheben Fehler 9504 (Die Datei '|' ist von der Access-Datenbank-Engine nicht lesbar) - Die Datei '|' ist vom Access-Datenbankmodul nicht lesbar. @Wenn Sie der Meinung sind, dass Sie über eine gültige Access-Datenbank verfügen, liegt dies höchstwahrscheinlich an der letzten Änderung des Dateiformats. Möchten Sie versuchen, das Datenbankformat zu aktualisieren?@@19@@@2.
Come fissare Errore 9504 (Il file '|' non è leggibile dal motore di database di Access) - Il file '|' non è leggibile dal motore di database di Access. @Se ritieni di avere un database di Access valido, è molto probabile che ciò sia dovuto alla recente modifica del formato del file. Vuoi provare ad aggiornare il formato del database?@@19@@@2.
Hoe maak je Fout 9504 (Het bestand '|' is niet leesbaar door de Access-database-engine) - Het bestand '|' is niet leesbaar door de Access-database-engine. @Als u denkt een geldige Access-database te hebben, komt dit waarschijnlijk door de recente wijziging van de bestandsindeling. Wilt u proberen de database-indeling te upgraden?@@19@@@2.
Comment réparer Erreur 9504 (Le fichier '|' n'est pas lisible par le moteur de base de données Access) - Le fichier '|' n'est pas lisible par le moteur de base de données Access. @Si vous pensez avoir une base de données Access valide, cela est probablement dû au récent changement de format de fichier. Voulez-vous essayer de mettre à niveau le format de la base de données ?@@19@@@2.
어떻게 고치는 지 오류 9504 (파일 '|' Access 데이터베이스 엔진에서 읽을 수 없습니다.) - 파일 '|' Access 데이터베이스 엔진에서 읽을 수 없습니다. @유효한 Access 데이터베이스가 있다고 생각한다면 최근 파일 형식 변경 때문일 가능성이 큽니다. 데이터베이스 형식을 업그레이드하시겠습니까?@@19@@@2.
Como corrigir o Erro 9504 (O arquivo '|' não é legível pelo mecanismo de banco de dados Access) - O arquivo '|' não é legível pelo mecanismo de banco de dados Access. @Se você acha que tem um banco de dados válido do Access, isso provavelmente se deve à recente alteração do formato do arquivo. Você deseja tentar atualizar o formato do banco de dados? @@ 19 @@@ 2.
Hur man åtgärdar Fel 9504 (Filen '|' är inte läsbar av Access-databasmotorn) - Filen '|' kan inte läsas av Access -databasmotorn. @Om du tror att du har en giltig Access -databas beror det troligtvis på den senaste filformatändringen. Vill du försöka uppgradera databasformatet? @@ 19 @@@ 2.
Как исправить Ошибка 9504 (Файл '|' не читается ядром базы данных Access) - Файл '|' не читается ядром базы данных Access. @ Если вы считаете, что у вас есть действующая база данных Access, это, скорее всего, связано с недавним изменением формата файла. Хотите попробовать обновить формат базы данных? @@ 19 @@@ 2.
Jak naprawić Błąd 9504 (Plik '|' nie jest odczytywany przez silnik bazy danych Access) - Plik '|' nie jest odczytywany przez aparat bazy danych programu Access. @Jeśli uważasz, że masz prawidłową bazę danych Access, najprawdopodobniej jest to spowodowane niedawną zmianą formatu pliku. Czy chcesz spróbować uaktualnić format bazy danych?@@19@@@2.
Cómo arreglar Error 9504 (El archivo '|' no es legible por el motor de base de datos de Access) - El archivo '|' no es legible por el motor de base de datos de Access. @Si cree que tiene una base de datos de Access válida, lo más probable es que esto se deba al reciente cambio de formato de archivo. ¿Quiere intentar actualizar el formato de la base de datos? @@ 19 @@@ 2.




The Author About The Author: Phil Hart has been a Microsoft Community Contributor since 2010. With a current point score over 100,000, they've contributed more than 3000 answers in the Microsoft Support forums and have created almost 200 new help articles in the Technet Wiki.


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