I came to this forum to find an answer to exactly the same question.
I already found out that the files are generated each time Express Scribe checks if there are dictations present on the ftp-server.
I thought it could have something to do, with keeping an eye on when dictation files were retrieved, bit I did not see any tool or option in either Express Scribe or Express Dictation that could make use of the file.
Could someone please explain what the purpose of these files is? Is there a way to prevent Scribe from generating them.
Thanks