How is a file loaded in the FAT file system?

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I am developing a bootloader in x86 Assembly and I have a question about the FAT file system.

Which steps are necessary to find and load the file?

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Hannu On BEST ANSWER

There is no simple answer, so I won't delve into it here.
You have to peek into the FAT (File Allocation Table) structures on the disk: https://en.wikipedia.org/wiki/Design_of_the_FAT_file_system

More, Reference:
https://en.wikipedia.org/wiki/File_Allocation_Table