Can I extract the full command line from an atop 1.23 data file?

My production servers have atop version 1.23, and I have a data file written by it from which I need to extract the full command line of a process. Unfortunately: * this version of atop won't display data beyond the 80th column of the display * horizontal scrolling was only introduced in 1.27 * newer versions refuse to read data files written by older versions * the file itself is compressed, so a simple strings search won't work Is there any way I can recover the full command line from my data file?