Use HEScript scripting combined with JavaScript window.external methods, for instance function window.external.GetHEScriptCom(ComLine, DefValue).

First, you need to create a script in HEScript that reads the contents of a text file. See the dedicated How to save/read external text files?

For instance, use this HEScript function in your UserMain script.

uses Classes; // Add this line to the top of your script

function ReadTextFile(Filename: String): String;
var
T: TStringList;
EbookPath: String;
begin
T := TStringList.Create;
EbookPath := GetGlobalVar("HEPublicationPath", "");
// Loads the text file.
T.LoadFromFile(EbookPath + Filename);
// Gets the contents.
Result := T.Text;
T.Free;
end;

Then you can call this directly from JavaScript:

var tex = window.external.GetHEScriptCom('UserMain.ReadTextFile|abc.txt', 'Error while reading file');

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