File as argument for Win32 application

How can I make a Win32 application open a fi开发者_开发百科le at startup when calling it like this (e.g. with a shortcut or via command line)?

program.exe "document.txt"

This link shows how to retrieve command line arguments and turn them into an array of string

Even though it is written in a main, it works equally well in WinMain or any other function

If you have a Unicode program use lpCmdLine, otherwise use GetCommandLineW and pass the result to CommandLineToArgvW to get a list of strings for the arguments to the program, then it works just like with a command-line program.