hi! we can't reproduce crash by ourself, but as I wrote above: we found out that it occurs in QuickLook when a user tries to open a file with unknown mimeType - application/octet-stream. QuickLook convert that files to known type (for an example - application/pdf), but crashes for the first opening the file. unfortunately, we don't have a file with unknown mimeType - application/octet-stream that crashes QuickLook when opened. I'm attaching a crash report below as txt file. quicklook crash.txt