Cant open rtf document

why i cant open this rtf document?
i succeded opening other rtf’s but this one is getting stack at this line:

doc = new Document(filePath);

and the program is freezed, it doesnt even come back with an error
why?

Hello!
Thank you for reporting this.
I have reproduced the case and logged it as issue #5961 in our defect database. We’ll investigate and try to fix it. Any available information will be posted here in the thread. Right now I cannot state why this happens.
As a workaround you can re-save this document with MS Word in the same RTF format. After such a roundtrip it opens without issues.
Regards,

The issues you have found earlier (filed as 5961) have been fixed in this update.