In a trigger,
MyFile is used to identify the data file that releases the trigger. At runtime, this keyword is automatically replaced with the current data file.
Benefit: MyFile is used to create generic triggers, without performing indirections on the H.FileName variable. This allows you to handle the data file, its properties or its items.
// Retrieve the name of the data file that activates the trigger
TriggeringFile = MyFile..Name