In threads covering similar issues (not being able to open files with paint 3d), some community members have tried resetting or reinstalling the application itself, or. You need to select this directory and the system32 folder in it, where you can find it. Many times, Paint 3D apps fail to run because they are stuck while updating in the Windows Store or due to errors. Updating apps like paint 3d will resolve the issue.
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Paint 3d is included in the Windows 10 package, so it is located in the %windir% directory on drive c.