I suspect what caused my file to disappear
was a terrible insidious attack of stupidity on my part
sometimes also attributed to other medical terms such as "carelessness",
"lack of long foresight" and "It really didn't occur to me when I deleted it 3 months ago"
I wish it was something as innocent as spyware. At least I have someone else to blame
but thanks for the warning. I shall run my arsenal of anti-spy weapons. *growl*