I just noticed frequent entries in the waste basket of a folder called browser and a file called imatch.pts.bak.
I assume this is some internal operation Imatch performs. Did not recall any mention of this - so I wonder if this
is cosher or some left-over artefact.
IMatch keeps a "last known good" copy of the settings database under the name imatch.pts.bak in the ...\config folder. Whenever IMatch starts successfully the old version of that file is deleted and replaced with the current PTS. This is why the file shows up in the recycle bin.
The "browser" folder may be the Chromium cache folder, if you have configured IMatch to delete the browser cache on exist.
Who looks into the recycle bin? Let Windows take care of it, it will delete the files automatically after a while.