The only way I know is human work.
I think the best thing is to exclude all available files, compile, check for valid errors, add one by one, and the drawings will not be added, you will delete.
Yes, I know that a lot of work, but there is some kind of utility.
Another way is to search in all your projects for each file name. If the only location for this file is Resources, delete it.
Sorry, do not help with another solution :(
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