Thank you Vovsoft for sharing this program.
The program seems good.
Notably, it’s possible to search within a selection of files using a filter.
But unfortunately, it’s not possible to exclude files from the search using a filter (for example, not searching in jpg, png, gif, xlsx, etc. files).
Furthermore, the PDF file search option only offers one among 3 methods exclusively : plain text PDF, or PDFium, or xPDF, but not all three simultaneously. Personally, I don’t know how the PDF files on my hard drive are encoded.
Perhaps the next version will include these improvements.