I'd suggest you read the Documentation for the low level file functions carefully, and make sure you understand them and what exactly you are doing. Experiment on test files. Reason being a statement like
will immediately destroy the file by truncating it's contents. There's no warning and you don't even have to 'save' the file.
After saying that, low level file functions can be used to manipulate both bog standard ASCII (text) files and binary files. They do not, however, load data into an application.
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