A dtproj file extension is related to the SQL Integration Services project files.
Software that open dtproj file
DTPROJ file extension - SQL Integration Services project
What is dtproj file? How to open dtproj files?
File type specification:
The dtproj file extension is used for SQL Integration Services project files used by Business Intelligence Development Studio from Microsoft.
The .dtproj files contain data used during creation of Integration Services packages.
The default software associated to open dtproj file:
Business Intelligence Development Studio 
Company or developer:
Microsoft Corporation
Business Intelligence Development Studio is special edition of Microsoft Visual Studio used to develop solutions including Analysis Services, Integration Services, and Reporting Services projects for SQL Server business intelligence. Microsoft Visual Studio 2010 does not support Business Intelligence Development Studio Integration Services, Report Services and Analysis Services projects for SQL Server 2008 and SQL Server 2008 R2. To work around this issue, you can install Visual Studio 2008.
List of software applications associated to the .dtproj file extension
Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open dtproj file, edit dtproj file, convert dtproj file, view dtproj file, play dtproj file etc. (if exist software for corresponding action in File-Extensions.org's database).
Hint:
Click on the tab below to simply browse between the application actions, to quickly get a list of recommended software, which is able to perform the specified software action, such as opening, editing or converting dtproj files.
Software that open dtproj file - SQL Integration Services project
Programs supporting the exension dtproj on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about Business Intelligence Development Studio for open dtproj file action.
