ExportAllStories.jsx output to one file

[SunFlower16]

There is a prebuilt script in Indesign called ExportAllStories.jsx that export documents stories into separate RTF to TXT file. Is there a modification for that script that exports all stories into one single TXT file? The order of merging is not important to me, just having one merged file matters. 

[Eugene Tyson]

There's a free trial option here with option to purchase for longer use.

https://www.rorohiko.com/wordpress/indesign-downloads/textexporter-4/

[Kasyan Servetsky · Accepted solution]

Check out this script written back in CS3 times. I remember there was a problem with exporting the Cyrillic text to Word/RTF format due to an InDesign bug: loads of superfluous question marks were added.