Index: openacs-4/packages/proctoring-support/lib/proctoring-upload.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/proctoring-support/lib/proctoring-upload.tcl,v
diff -u -r1.1.2.18 -r1.1.2.19
--- openacs-4/packages/proctoring-support/lib/proctoring-upload.tcl	4 Mar 2022 09:55:28 -0000	1.1.2.18
+++ openacs-4/packages/proctoring-support/lib/proctoring-upload.tcl	20 Apr 2023 14:52:55 -0000	1.1.2.19
@@ -43,6 +43,12 @@
                             -object_id $object_id -user_id $user_id]
 
     if {$type eq "audio"} {
+        #
+        # Audios are assumed to be webm files. One could do better and
+        # peek into the file like we do in the commented line,
+        # however, this would not scale. Exec-free solutions are
+        # welcome!
+        #
         # set mime_type [exec [util::which file] --mime-type -b ${file.tmpfile}]
         set mime_type video/webm
     } else {