Hi Chris Thank you for the reply. So, on the Windows 10 pc I set the Target Framework for every project in the App to .NET Framework 4.5.2. I now have a problem I need help with: One project in the App is a Windows Forms project, called from another Windows Form. This project also contains a class (called Amends) that contains public methods to read to extract information from data files and pass back to the main form. This class is instantiated from the Form_Load handler of the form. The constructor in this class opens the data file. The App is crashing on the line set cls-amend to new Amends. where cls-amends is of type Amends. The class definition for Amends with constructor is: class-id Amends. ENVIRONMENT DIVISION. ... DATA DIVISION. ... method-id NEW. procedure division. IN010. * Open data file. goback. end method. * public methods ... end class. When I change the Output Type for this project to Windows Application and run in VS the last three lines of the Output window are: Exception thrown: 'System.InvalidProgramException' in IPAMENDS.exe 'IPAMENDS.exe' (Managed (v4.0.30319)): Loaded 'C:\WINDOWS\assembly\GAC_MSIL\Microsoft.VisualStudio.Debugger.Runtime\14.0.0.0__b03f5f7f11d50a3a\Microsoft.VisualStudio.Debugger.Runtime.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. The program '[8028] IPAMENDS.exe: Managed (v4.0.30319)' has exited with code -1073741819 (0xc0000005) 'Access violation'. The same thing happens when I change the Target Framework back to .NET Framework 4 Client Profile or .NET Framework 4.6.1, or when the project is called from the main App form as a dll. No code changes have been made from VC 2.1 to VC 2.3, the only thing changed is Target Framework. I am also puzzled as to why (Managed (v4.0.30319)) appears in the Output Window when the Target Framework is 4.5.2. I searched for this error and Microsoft says it may be a bug in the compiler. Other details: Windows 10 Pro version 10.0.10586 Build 10586 Microsoft Visual Studio Community 2015 version 14.0.25431.01 Update 3 Micro Focus Visual COBOL 2.3 Version 2.3.00134. Trial version. Microsoft .NET Framework version 4.6.01038 Platform Target for all projects in App is Any CPU. Thank you Brendan
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