My first steps would be:
1. Right click on an empty space on the desktop
2. New AutoIt v3 Script
3. Right Click on the created new file
4. Edit
5. Paste a simple example like this and save
#include <File.au3>
#include <MsgBoxConstants.au3>
Local $sFind = "д"
Local $sReplace = "d"
Local $sFileName = "test.txt"
Local $iRetval = _ReplaceStringInFile($sFileName, $sFind, $sReplace)
If $iRetval = -1 Then
MsgBox($MB_SYSTEMMODAL, "ERROR", "The pattern could not be replaced in file: " & $sFileName & " Error: " & @error)
Exit
Else
MsgBox($MB_SYSTEMMODAL, "INFO", "Found " & $iRetval & " occurances of the pattern: " & $sFind & " in the file: " & $sFileName)
EndIf
6. Create a text file in same location as the script: test.txt
д some text д more text д
7. Return to the SciTe Editor
8. Place the cursor on the name of some function and press F1 for HELP File (_ReplaceStringInFile in the example above)
9. Press F5 for running the script
10. Repeat again and again: HELP FILE / simple examples for functions / Test ...