does Kindle create a crash log?
I had my KDXG restarted while testing one of the previous versions.
a bit off topic
stating the obvious, the file searcher just written by dave2008 (along with the corresponding lines from mupdf to make it a stand-alone solution) represents a file search system hack, which can be improved
1) by showing the complete name (just like kindle does, if the file name is long) -> also relevant for mupdf
2) by associating files with certain applications (e.g. to open a pdf file with the mupdf or the native pdf viewer)
3) by enabling searching in all files through indexing (in case of pdf files, it may also be relevant for mupdf)