Windows temp files not cleaned-up #129

When I start the MiniZinc IDE 2.5.2 under Windows with an empty %TEMP% directory, I get remaining files mzn_*.mpc.

Identical content of the files:

{
    "intermediate-solutions": true,
    "solver": "org.gecode.gecode@6.3.0"
}

For each of the following steps, two or three of these files are created:

1. Starting the IDE
2. Opening my most recent *.mzn file
3. Running the Gecode solver

I tried and reset the Gecode solver configuration to default values, but the behaviour remained unchanged.

The files are not removed after closing the IDE.