How to eliminate a troublesome warning from ModelSim

Hi,
From the first day when I started using ModelSim, a troublesome warning from ModelSim accompanies me each time I use ModelSim.
I use Notepad++ to edit my *.vhd files, after recompiling the files, it always shows the following error report:
# Compile of *
.vhd was successful.
# ** Error:
# g
# Unable to replace existing ini file (xxx.mpf). File can not be renamed.
# ** Error: unrecognized string explaining the reason
# g
# Unable to replace existing ini file (xxx.mpf). File can not be renamed.
# ** Error: unrecognized string explaining the reason
# $
# Unable to replace existing ini file (xxx.mpf). File can not be renamed.
Actually, I never touch or open the *.mpf files.
After several recompiling, I found many *
.mpf files, here is a typical file name:
*.mpf
*
.mpf_new
I always skip the error report.
What causes ModelSim to generate such an error report and how to avoid its creating?
Thank you.
Weng

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Tianxiang Weng
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