What I meant was that if there is a space after a dot, it should be put there (like in the screenshot attached). If there isn't, then of course it shouldn't. I have just tested "is in file" comparison operator and I can confirm that it works.
The manual did not mention the saddle cloth specifically, because "is in file" can be used for looking for anything at all, not only names. But I will include a paragraph on this somewhere in the manual.