Why could the more useful "multi-line" mode be turned off?* Find Files | Contents: Now mode "RegExp" will work in "single line mode".
That means a pattern like ^\xFF\xD8 will now match only the beginning of
the file, not the beginning of any line in the file.
In any case, XY would scan only the first 1K to 32K of a file. The small size won't impact the search performance.