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What replaced the autoexec.bat file?
Nothing. Windows NT has never used an autoexec file. Perhaps its time for you to buy a new PC.
\_(ツ)_/
To learn about the old autoexec,bat file you could easily just search for it on the net.
Here is a good starter that will explain it and tell you why it is no longer used.
https://en.wikipedia.org/wiki/AUTOEXEC.BAT
-- Bill Stewart [Bill_Stewart]