Analysis of information sources in references of the Wikipedia article "Windows Notepad" in English language version.
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This is not the first time the app has appeared in the Microsoft Store. Originally announced in August last year, Notepad appeared for a while before vanishing.
To load a file, Notepad maps a view of the file as a memory-mapped file and uses that as the source. The code figures out the encoding, performs a code page conversion to UTF-16LE if necessary, puts the result in a memory block, and then uses the EM_SETHANDLE message to hand that entire block to the edit control.
