.def Extension - List of programs that can open .def files

In the following table, you can find a list of programs that can open files with .def extension.This list is created by collecting extension information reported by users through the 'send report' option of FileTypesMan utility.
The product name, description, and company name are taken from the version information of the .exe file.The 'Actions' list is taken from the context menu items added to Explorer by the specified program.The 'Popularity' column displays one of the following 4 values: Low, Medium, High, and Very High, which is determined according to the number of users that sent the specified record.

EXE Name	Product Name	Description	Company	Actions	Popularity
cfx5solve.exe				open	Low
devenv.exe	Microsoft� Visual Studio� 2013	Microsoft Visual Studio 2013	Microsoft Corporation	Open	Medium
devenv.exe	Microsoft? Visual Studio? 2013	Microsoft Visual Studio 2013	Microsoft Corporation	Open	Low
devenv.exe	Microsoft� Visual Studio� 2005	Microsoft Visual Studio 2005	Microsoft Corporation	Open	Medium
devenv.exe	Microsoft� Visual Studio .NET	Microsoft Visual Studio .NET 2003	Microsoft Corporation	Open	Low
devenv.exe	Microsoft� Visual Studio� 2010	Microsoft Visual Studio 2010	Microsoft Corporation	Open	High
devenv.exe	Microsoft� Visual Studio�	Microsoft Visual Studio 2017	Microsoft Corporation	Open	Low
devenv.exe	Microsoft� Visual Studio� 2008	Microsoft Visual Studio 2008	Microsoft Corporation	Open	Medium
devenv.exe	Microsoft? Visual Studio? 2008	Microsoft Visual Studio 2008	Microsoft Corporation	Open	Low
devenv.exe	Microsoft� Visual Studio� 2012	Microsoft Visual Studio 2012	Microsoft Corporation	Open	Low
devenv.exe	Microsoft� Visual Studio� 2015 Preview	Microsoft Visual Studio 2015 Preview	Microsoft Corporation	Open	Low
devenv.exe	Microsoft� Visual Studio� 2015	Microsoft Visual Studio 2015	Microsoft Corporation	Open	Low
NOTEPAD.EXE	Microsoft� Windows� Operating System	Notepad	Microsoft Corporation	edit, open	Low
VCExpress.exe	Microsoft� Visual Studio� 2008	Microsoft Visual C++ 2008 Express Edition	Microsoft Corporation	Open	Medium
VCExpress.exe	Microsoft� Visual Studio� 2010	Microsoft Visual C++ 2010 Express	Microsoft Corporation	Open	Medium
viw.exe	Open Watcom	Open Watcom Text Editor	openwatcom.org	open	Low
WDExpress.exe	Microsoft� Visual Studio� 2013	Microsoft Visual Studio Express 2013 for Windows Desktop	Microsoft Corporation	Open	Low

In the following table, you can find a list of file types information that is associated with .def extension.

Type Name	Description	Perceived Type	ContentType	DLL/EXE File	DLL/EXE Details	Popularity
	Export Definition File	text	text/plain	VCProject.dll	Visual C++ Build System Package, Microsoft Corporation	Low
ANSYS v160 .def File	ANSYS v160 .def File	text	text/plain			Low
deffile	Module Definition File	text	text/plain	viw.exe	Open Watcom Text Editor, openwatcom.org	Low
def_auto_file		text				Low
VCExpress.def.10.0	Export Definition File	text	text/plain	VCProject.dll	Visual C++ Build System Package, Microsoft Corporation	Medium
VCExpress.def.10.0		text				Low
VCExpress.def.9.0	Export Definition File	text	text/plain	VCProject.dll	Visual C++ Build System Package, Microsoft Corporation	Medium
VCExpress.def.9.0						Medium
VisualStudio.def.10.0						Low
VisualStudio.def.10.0	Export Definition File	text	text/plain	VCProject.dll	Visual C++ Build System Package, Microsoft Corporation	High
VisualStudio.def.11.0	Export Definition File	text	text/plain	VCProject.dll	Visual C++ Build System Package, Microsoft Corporation	Low
VisualStudio.def.12.0	Export Definition File	text	text/plain	VCProject.dll	Visual C++ Build System Package, Microsoft Corporation	High
VisualStudio.def.14.0	Export Definition File	text	text/plain	VCProject.dll	Visual C++ Build System Package, Microsoft Corporation	Medium
VisualStudio.def.7.1	Export Definition File	text	text/plain	VCProject.dll	Visual C++ Build System Package, Microsoft Corporation	Low
VisualStudio.def.8.0						Low
VisualStudio.def.8.0	Export Definition File	text	text/plain	VCProject.dll	Visual C++ Build System Package, Microsoft Corporation	Medium
VisualStudio.def.9.0	Export Definition File	text	text/plain	VCProject.dll	Visual C++ Build System Package, Microsoft Corporation	High
WDExpress.def.12.0	Export Definition File	text	text/plain	VCProject.dll	Visual C++ Build System Package, Microsoft Corporation	Low

Registry keys related to this extension

HKEY_CLASSES_ROOT\.def
HKEY_CLASSES_ROOT\ 
HKEY_CLASSES_ROOT\ANSYS v160 .def File
HKEY_CLASSES_ROOT\deffile
HKEY_CLASSES_ROOT\def_auto_file
HKEY_CLASSES_ROOT\VCExpress.def.10.0
HKEY_CLASSES_ROOT\VCExpress.def.9.0
HKEY_CLASSES_ROOT\VisualStudio.def.10.0
HKEY_CLASSES_ROOT\VisualStudio.def.11.0
HKEY_CLASSES_ROOT\VisualStudio.def.12.0
HKEY_CLASSES_ROOT\VisualStudio.def.14.0
HKEY_CLASSES_ROOT\VisualStudio.def.7.1
HKEY_CLASSES_ROOT\VisualStudio.def.8.0
HKEY_CLASSES_ROOT\VisualStudio.def.9.0
HKEY_CLASSES_ROOT\WDExpress.def.12.0

Links to other Web sites

• .def information on www.fileinfo.com
• .def information on filext.com
• .def information on file-extensions.org

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