Searching for text in DJVU files through the Windows search panel

I have many DJVU files with OCR in one folder. What should be done or how can I search for words in these files through the search field in the folder (top left)? There is a reference to the DjVuOCR plugin for Windows by Vladimir Levenshtein on the internet, but I cannot find it anywhere. Converting 798 DJVU files to PDF with working OCR is not feasible. Thanks for the help.