If COM is allowed, then if the file is 100K (assuming ANSI 1 byte/char.) then there are ~100,000 characters in the file. If you just want the last 10K of the file or so, you can use the TextStream object from the scripting library. It contains a 'Skip' method which takes a number of characters to skip (90,000 in this example). Then just call ReadAll and you'll get the rest of the text from the file.
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Stevie