In HTA you are free to use any ActiveX you want. FileSystemObject is the best solution for simple folder and file actions, though it can read and write text files only. With this ActiveX Control you can also create and delete folders and files, retrieve their properties etc.
FSO and HTAs are still working in IE9. However, all development and support was ended at IE7, so all HTML and JavaScript capabilites (and bugs) are on that level too. To utilize features available to IE9, use <meta http-equiv="x-ua-compatible" content="ie=9"> in <head>. This works with single pages only, and can't be used within frameset-pages.
FileSystemObject: http://msdn.microsoft.com/en-us/library/6kxy1a51%28v=vs.84%29.aspx
HyperText-Applications: http://msdn.microsoft.com/en-us/library/ms536471%28v=vs.85%29.aspx
Basic functions in FileSystemObject
Create an ActiveX:
fso=new ActiveXObject('Scripting.FileSystemObject');
Write a file:
var oStream=fso.OpenTextFile('SAVE_PATH',2,true);
oStream.WriteLine('YOUR_DATA'); // Usually looped for several lines
oStream.Close();
Open a file:
var iStream=fso.OpenTextFile('OPEN_PATH',1,false);
data=iStream.ReadLine(); // Usually looped for several lines
iStream.Close();
See also WScript.Shell: http://msdn.microsoft.com/en-us/library/98591fh7%28v=vs.84%29.aspx
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