I am having Wndow 7 platform.
I have an Adobe file with extention ".part" but could not open it. I got a message that "this file is either not supported or damaged while attached to an email message".
I had downloaded "Adobe Digital Edition" + "PDF Converter" and PDF Fix toolbox". But still will not open.
Any help to open this file is highly appreciated.
It sounds as if the ' damaged while attached to an email message' suggestion is correct;
or maybe damaged as you extracted it.
.part is usually associated with email attachments.
Digital editions will only expect to work on .acsm, .epub and .pdf files.
Re- post please clarify ...