How can I force Excel 2007 on Windows 7 to always open another instance of the application?
71010
How do I force Excel (and other Microsoft Office products) to stop opening files in the same application?
151364
Force file extension to open with specific app (Extensions like .exe, .jpg, .mp4...)
97140
Choose a default app for opening files with no extension?
153260
Opening MS Excel worksheet in C#
108389
Why does my Mac's list of "Open with" applications start listing the apps twice and sometimes three times?
74085
How do you force the focus of an Excel Cell to remain the same?
21731
How do I properly clean up Excel interop objects?
124436
Return to an already open application when a user tries to open a new instance
146697
How do I reopen an instance window once it has disappeared from desktop?
57391
How to inject VBA code into Excel .xlsm without using Interop?
84555
Is there a possibility to start another App or Program from a Windows 8 Store App (C#)
91643
VBA workbooks.Close without being prompted to if the user wants to save?
35662
"Always use this program to open these files" is grayed out. Why?
1661
How do I set the default program?
33446
How do I start a second instance of a program from Unity's launcher?
101278
How can I add an application to the list of Open With applications?
37490
Run program as admin without entering credentials? (Automatic Win7 elevation)