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I was under the impression that when you double click a file (or choose 'Open With' from the right click menu), Windows simply calls the application with the filename as the parameter. Something like this:
C:\> App.exe file.abc
However, I just double clicked an .xls file and then checked the PEB of the Excel instance that sprang up. To my surprise the commandline did not contain the filename as a parameter.
So that set me wondering. What exactly is the mechanism Windows uses to have a file opened by a relevant application? Is there a special API that each application that supports such facility must expose?
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Open a window and position it where you like. Then double-click the icon in the upper left corner of the window. This should cause Windows to remember where the window was last opened.
The basic rule of thumb is that you should close your windows when the temperature outside starts to exceed the temperature inside. It may seem counterintuitive, but as the temperature climbs, you'll often make your home warmer, not cooler, by opening the windows.
How Windows passes the file to the program varies from one application to another. This behavior is controlled by the registry.
In the case of Excel they use what is called DDE for the purpose. That's why you see nothing on the command line.
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