Openstudio is installed but OS file doesn't open [closed]

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I have a series of simulations ran from OS 3.2.0. I installed the new version of 3.2.5 but then because it was time taking to while opening my files in new version, I decided to go back to OS 3.2.0 I uninstalled the new version and installed the OS 3.2.0, but I am not able to open the previous files. The OS is showing installed in my Program Files, but files do not open. Would you please advise on this?