C#
C# (see section on name, pronunciation) is an object-oriented programming language developed by Microsoft as part of the .NET initiative and later approved as a standard by ECMA (ECMA-334) and ISO (ISO/IEC 23270).
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It turns out that using Explorer isn't working so well for users.
The filetype I'm opening in code is .jpg and on a user's machine it's associated with the Windows Picture and Fax Viewer....