Yet again, calling xyz application trash for something it is not responsible for. Cool down....
OK, let's try from the simple steps:
Step 1: google "
osx rebuild open with menu" and at the top Mr. Google presents instructions how to rebuild launch services. Did you follow that and did it work or not?
Step 2: If not, you probably have checked for Parallels "share applications with OSX" (at least that how it was called few versions ago) and it has installed in your Applications a folder "Windows" or something with links/starter apps to your Parallels applications. From OSX point of view these look like applications and it associates them with files they advertise as capable of opening. So, it will add these to Open with menu (launch services). Delete those links (the whole folder) and yet again rebuild the launch services.
Step 3: Still not solved??? Well, now I am confused also. In that case it is becoming worth challenge. And may be being annoyed. It should not be that difficult...
Parallels have quite active discussion forum and you should be able to get help there. It is routinely answered by Parallels staff.
Until step 3, YOU installed Parallels and actually a whole new OS (Windows) with lot os applications, YOU chose to have applications shared in the configuration. There are no automatic uninstallers for most OSX applications, Parallels are uninstalled by deleting the application itself (well, most of it anyway) - and the remnants need to be cleaned up by system maintenance and user.
OSX should routinely rebuild launch services, but I am not sure what the schedule is...
Not sure if appcleaner (which I use also) would be able to find and remove these app links/starters... I cannot try that on my system...