The supported file formats for text files and scripts and their notation in popular editors are shown in this table:
|AutoIt Notation||Notepad||Notepad++||SciTE (AutoIt Default Editor)|
|UTF8 without BOM||ANSI or UTF-8 depending on content (will force a BOM if saved)||UTF-8 without BOM||UTF-8|
|UTF8 with BOM||UTF-8||UTF-8||UTF-8 with BOM|
|ANSI||ANSI||ANSI||8 bit / Code Page Property|
|UTF16 Little Endian||Unicode||UCS-2 Little Endian||UCS-2 Little Endian|
|UTF16 Little Endian without BOM||Unicode (will force a BOM if saved)||UCS-2 Little Endian without BOM (can't be selected)||Unsupported|
|UTF16 Big Endian||Unicode big endian||UCS-2 Big Endian||UCS-2 Big Endian|
|UTF16 Big Endian without BOM||Unsupported||UCS-2 Big Endian without BOM (can't be selected)||Unsupported|
The recommended script format is UTF-8 with BOM as that works best with notepad.exe and the AutoIt editor SciTe and guards against scripts unintentionally getting saved in a particular code page.
ANSI formats are not recommended as they can cause problems when run on machines with different locales.
UTF16 BE or LE without a BOM are not recommended. They are widely unsupported. Even with a BOM they are not particularly common and they take up much more disk space than UTF8.
There are a few parts of AutoIt that don't yet have full Unicode support. These are:
These limits will be addressed in future versions if possible.