diff --git a/private/file-walker.rkt b/private/file-walker.rkt
index 573e339..9b89c2f 100644
--- a/private/file-walker.rkt
+++ b/private/file-walker.rkt
@@ -19,7 +19,8 @@
   (let ((delim (if (eq? (system-path-convention-type) 'windows) "\\" "/")))
     (string-replace str "/" delim)))
 
-(define (make-file-walker base-path glob-pattern filter-func)
+(define (make-file-walker base-path glob-pattern filter-func
+                          #:filename-cleaner [filename-cleaner-func (λ (f) f)])
   (let* ((gen (sequence->generator
                (sequence-filter
                 (λ (p)
@@ -40,7 +41,7 @@
             (values #f #f #f)
             (let* ((bd (basedir path))
                    (bn (format "~a" (basename path)))
-                   (nbn (clean-os-basename bn))
+                   (nbn (filename-cleaner-func (clean-os-basename bn)))
                    )
 
               (unless (string=? bn nbn)
@@ -81,7 +82,7 @@
     )
   )
 
-(define (make-file-admin base-path db-store)
+(define (make-file-admin base-path db-store #:filename-cleaner [fc-f (λ (f) f)])
 
   (define (file-info-equal? i1 i2)
     (if (eq? (hash-ref i1 'type) (hash-ref i2 'type))
@@ -181,7 +182,9 @@
                                    )
                                  (set! walker-count (+ walker-count 1))
                                  (let-values (((base-path* path* info*) (file-admin base-path path info)))
-                                   (values base-path* path* info*)))))
+                                   (values base-path* path* info*)))
+                               #:filename-cleaner fc-f
+                               ))
          (deleted #f))
     
     (init-db-sweep)
@@ -256,4 +259,5 @@
                   ((string=? stem3 "") "_")
                   (reserved? (string-append "_" stem3))
                   (else stem3))))
-    (string-append stem4 ext)))
\ No newline at end of file
+    (string-append stem4 ext)))
+