Access Database — Microsoft Access database.
Quick facts
What is .mdb
A .mdb file is a Access Database — Microsoft Access database.
In the mime-db registry it maps to application/x-msaccess. When serving .mdb over HTTP, set the Content-Type header as shown in Developer info below.
Related entities: it maps to application/x-msaccess — and is delivered over HTTP via the Content-Type header.
How to open .mdb files
Developer info
When served over HTTP, responses should set the following header:
Content-Type: application/x-msaccess
Common software that reads/writes .mdb:
Relation chain
Related extensions
Related MIME types
Common uses
How to edit .mdb files
How to create .mdb files
Frequently asked questions
Common options include Microsoft Access, LibreOffice Base. You can also open many of these files with built-in viewers or a browser.
Create a new file in any text editor or the app that owns the format and save it with the .mdb extension.
application/x-msaccess is the media type identifier used for .mdb files during network transfer (for example in the HTTP Content-Type header).
Sources & standards
Updated 2026-08-18
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