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Microsoft SyncToy Leaves .tmp (Temp) Files Behind

I’ve been using Microsoft’s free “SyncToy” [1]program to keep the content on my main computer and my tablet PC synchronized. It works well, and can even be run automatically from the command-line, which opens up all sorts of scheduling possibilities. However, it periodically leaves behind cryptically named temporary files.

For example, after synchronizing my music folder, I found a file named “FSP-{1CE72381-291F-42C4-92B7-46862E0D7FC2}.tmp”. Currently, my computer has 4 similarly named files dispersed throughout its hard drive. The sizes of these files range from 0 bytes all the way up to 80 megabytes. Clearly, this is a bug in the SyncToy program, which results in these temporary files being left behind. The only other info I have found on the problem is in this Microsoft Communities post [2], which lacks any real substance. While there is no fix that I am aware of, I have been able to clean up my computer by periodically searching my computer for files named “FSP*.tmp”, and deleting all the returned files.

I imagine this problem will be fixed in the final release version of SyncToy, if that ever comes.