digiKam crashing on every second or third XCF file - is there a config file I can modify?

[Elle Stone]

Currently I have just over a thousand GIMP-2.9 XCF files on my computer, 
all in subfolders of a folder named "edit". I'd like to use digiKam to 
sort through and reorganize these files, and along the way delete 
duplicates and unwanted files.

I know digiKam doesn't make thumbnails for GIMP-2.9 XCF files, so I used 
a script to create "xcf.png sidecar" files to go along with the actual 
XCF files. These "sidecar" files imported into the database without any 
problems. For this preliminary import I put "-xcf" in the list of 
additional mimetypes, to tell digiKam to not import actual XCF files.

Unfortunately, upon asking digiKam to add XCF files to the list of files 
to be imported into the database (by removing "-xcf" from the list of 
additional mime types), digiKam now crashes on every third or fourth XCF 
file it tries to scan.

Is there a configuration file that I can open and edit to tell digiKam 
to not scan for XCF files? Right now every time I start digiKam it 
crashes after scanning only two or three XCF files, so "find and remove" 
the problematic XCF files just isn't going to work.

Best,
Elle