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Where can I find the PRJ files that describe the coordinate systems?

After running the setup for PTV Visum the PRJ files are stored to the following folder:
c:\Program Files\PTV Vision\PTV Visum 2020\Exe\Projections\
Each user has an own copy from which PRJ files can be added or removed:
c:\Users\%USERNAME%\AppData\Roaming\PTV Vision\PTV Visum 2020\Projections\

- Vista: C:\Documents and settings\%USERNAME%\Anwendungsdaten\Visum\125\Projections\
- Windows7: C:\Users\%USERNAME%\AppData\Roaming\Visum\120\Projections\;10.00