Finally there is an official way of setting a text file as your Desktop Background: Windows Sysinternals BgInfo. This tool can show a lot of information about your system but may also show the contents of a Textfile: Press the button
Custom...on the right and then
New.... There you may select
Contents of a fileand include a path to the text file. After you saved the BfInfo config file somewhere on your system, you can call BgInfo in the following way to update the background image:
This may be useful to show log files that you want to keep an eye on or the shadowfile of your favorite TaskWarrior report.
bginfo c:\System\config\bginfo.bgi /timer:0