i'm not sure i get the question of the original poster (why are you trying to find filenames from a text editor?)
but the technology of this "match with spell errors" or "match ignoring letter accents" is called fuzzy search. xplorer2 pro
has this feature for its find files command. See the red-hilighted box in this snapshot:
Brillant Text Editor (search functions)
a value of 100 means exact text search. Lower values increase the "fuzziness" and allow more things in the results, including spelling errors. The down side is that other unrelated files will show up too, but hey!