Possibly related to:
https://winscp.net/tracker/1583
https://winscp.net/tracker/1583
Before posting, please read how to report bug or request support effectively.
Bug reports without an attached log file are usually useless.
I am facing exactly the same issue.
Considering the age of this post, looks like there is no solution.
Microsoft Visual Studio Premium 2012
Microsoft .NET Framework Version 4.5.50938
Installed Version: Premium
Microsoft Visual Studio Tools for Applications 2012
Microsoft Visual C# 2012
NuGet Package Manager in Visual Studio.
SQL Server Analysis Services
Microsoft SQL Server Analysis Services Designer
Version 11.0.5058.0
SQL Server Data Tools 11.1.50226.0
Microsoft SQL Server Data Tools
SQL Server Integration Services
Microsoft SQL Server Integration Services Designer
Version 11.0.3369.0
SQL Server Reporting Services
Microsoft SQL Server Reporting Services Designers
Version 11.0.3369.0
TITLE: Microsoft Visual Studio
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Cannot show the editor for this task.
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ADDITIONAL INFORMATION:
Exception from HRESULT: 0x80131940 (Microsoft.SqlServer.DTSRuntimeWrap)
TITLE: Microsoft Visual Studio
------------------------------
Failure saving package.
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ADDITIONAL INFORMATION:
'.', hexadecimal value 0x00, is an invalid character. Line 2, position 13. (Microsoft.SqlServer.ManagedDTS)