Hi. I don't think it would be possible to attach a specific file because the program failed with every single raw file I tried to open. That includes .raf, .nef, .rw2 files. I tried about a dozen from cameras of varying years of production (as early as 2014). I tried three different versions of Affinity as well (1.7, 1.8, 1.9). None worked, which led me to suspect system specific issues. Then I uninstalled Adobe DNG converter (it wasn't registered in the system uninstall menu, so I manually deleted it and purged the system of null registry keys just in case). The result is that Affinity is opening all raw files without issue.
Perhaps the issue is WHEN the Adobe DNG converter is installed... or what version of it is installed. Sorry if I can't be of help.