File Extension Database

Open DEF File

DEF extension files can take various application formats, some of them below

M.U.G.E.N.

In this first case, the DEF file is a game data file used by M.U.G.E.N., a sprite-based game engine used to make 2D fighting games.

More about M.U.G.E.N.

It is a freeware 2D fighting game engine designed by Elecbyte.

Content is created by the community, and thousands of characters, both original and from popular fiction, have been created.

It was programmed in C through the Allegro library.

The latest versions of the engine use the SDL library.

The DEF file contains the definition of a character, that's where the acronym comes from, including the character's name and version information and the character specification files used by the engine.

Smartware II

In this case, the DEF file is a database and spreadsheet format used by the SmartWare II database software.

More about Smartware II

SmartWare II allows users to create or modify a switching strategy and send it to a control.

It also allows you to read the current configuration, save or load a configuration to or from a file, monitor control operation in real time, and retrieve historical data.

IOBit Malware Fighter

In the latter case, the DEF file is a file used by IObit Malware Fighter, a program used to remove malware and spyware from the PC.

IObit Malware Fighter is one of the most widely used antivirus packages worldwide, however, it has received negative reviews on certain occasions.

The DEF file stores virus definitions used to identify and remove malware from your computer.

DEF files use the file names core000.def, core001.def, core002.def, etc. They are stored in the db\ directory of the IObit Malware Fighter installation.

Microsoft VisualStudio

In this case, the DEF file lists the exports and attributes of a program to be linked by an application linker.

The DEF is used in software development when creating a DLL.

DEF files are used by Microsoft Visual C++, a component of Microsoft Visual Studio, as well as other C++ development software.

More about Visual Studio

This is Microsoft's flagship integrated development environment.

It is used to develop any type of software, due to the large number of languages ??and scripts it handles.

Among his development examples are computer programs, websites, web apps, web services and mobile apps.

Software to open and work with a DEF file

Typical DEF application file locations:

"g:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\IDE\devenv.exe" /dde
c:\Program Files (x86)\Microsoft Visual Studio 9.0\Common7\IDE\devenv.exe /dde
"C:\Program Files (x86)\Microsoft Visual Studio 9.0\Common7\IDE\devenv.exe" /dde

Typical DEF mime types:

text/plain

Frequently used application names to open DEF files:

Microsoft Visual Studio 10.0
Microsoft Visual Studio 9.0

Frequently associated Windows objects:

VisualStudio.def.10.0
VisualStudio.def.9.0

How Can I Open DEF File on Windows

We researched and learned that the best way to open DEF file is to find a DEF file in question in Windows OS File Explorer and double click on it to launch the corresponding application.
If a DEF file is not opened in an application and you instead get a "Windows can't open a file" error message you should try looking for an application which can open the file in question.
If you know the application which can open DEF file then run it and see if there is a File->Open main menu option in the application.
If you don't know the application which function as DEF file opener then try to search online for "DEF viewer", "application to open DEF file" or "open DEF file" queries in the search engine you like.
Install the application you found and check if it can open DEF file

How Can I Open DEF File on Mac OS

We recommend to find a DEF file in question in Mac OS Finder and double click on it to launch the corresponding application.
If a DEF file is not opened in a Mac OS application and you instead get a "There is no application set to open the file" error message you can click on "Search App Store" in the error dialog and Mac OS will show you applications compatible with DEF file.
If you know the Mac OS application which can work as DEF file opener you can choose the "Choose Application..." option in the error box to associate the file extension and open DEF file in it.
If you don't know the application which can open DEF file then try to search for "DEF viewer", "application to open DEF file" or "read DEF file" queries in the online search engine you like.
Install the application you found and check if it can read DEF file

How Can I Open DEF File on Android

If you downloaded a DEF file on Android device you can open it by following steps below:

In the Android apps list on your Android device find "My Files" or "File manager" app and tap to start it.
Tap on "Downloads" folder inside the app.
You should see your downloaded DEF file in that folder.
Tap on the file. If Android device supports opening the file you downloaded it will open in the corresponding app.
If file does not open you can look for the corresponding app that can open the file by searching Android App Store for the "DEF".
If you cannot open the file with the apps from Android App Store it is possible that the file could only be opened on desktop platforms such as Windows or Mac OS. Try searching for "DEF viewer", "DEF file reader" online and see if any desktop applications can open it.
It is also possible that the file you downloaded is outdated and is no longer supported.

How to Open DEF File on iPhone or iPad

To open DEF File on iOS device follow steps below:

We advies to open Files app on your iPhone or iPad device. You can find it by swiping down on the home screen and typing "Files" in the search bar.
Tap on the Downloads folder on the Files app home screen.
You will see all files that you recently downloaded. Tap on the DEF file to view it.
If you have the right app that can open it it will automatically launch and open your file.
If you don't have the app which can open it you need to serch Apple app store for "DEF". This way you can find apps which can open DEF files.
If this doesn't help it is possible that your file could be opened only by the desktop application. To find an app which can open it on desktop look for "DEF viewer" or "DEF file" online in your favorite search engine.

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