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When you drag and drop a "data" file to your .EXE in Windows Explorer: the .EXE will run, and the name of the data file will be available to the program in the Command() variable.
While testing, you can set a parameter within the Project menu, Properties, Make tab which simulates the input into Command().
If you associate your .EXE with a certain data file extension, and then double click on one of those data files: the same thing will apply - the Command() variable will have the filename in it.
Be aware: The parameter sent from Windows Explorer can be slightly different on different operating systems (short names vs long names), and it can have multiple files within it.
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My first guess would be the command function.
The Commmand function returns the commandline arguments, your program was started with, so try that.
