No way that I can find. I can't even copy and paste the file path in the Texture Manager.

Perhaps a little Wacro could be used to update the Poser.ini parameter from the path of the currently-selected Image Map node, then the Browse button would open the right folder.

"If I were a shadow, I know I wouldn't like to be half of what I should be."
Mr Otsuka, the old black tomcat in Kafka on the Shore (Haruki Murakami)