Finding where a file is referenced in a *.umap file?

A file which no longer exists after uninstalling Houdini’s Plugin, HoudiniEngine/Tools/rock_generator_2038A8D542A8/rock_generator_2_3_0_0_0_3_0_0_0_main_geo_838A912C, is being referenced from a umap file in my project. I’m able to find it in a hex editor and through grep, but not through the UE4 map editor. It being referenced is causing cook errors for me, so I need to find a way to get it out of my file.

Is there some tool I can use to convert the umap file to something human-readable, or is there some other way I can find out where the file is referenced?