Hi there, I'm Matt Sergei (do call me Matt, please) and can help you create your application -
can you expand more about what analysis, editing and format conversions need to be made?
E.g.
1. Text files - what formats, rich text editing (Word?), page formatting and breaks, layout, margins etc.
2. Image files - what formats, what graphical operations (scale, crop, filters, drawing overlaid shapes, ...).
3. Audio files - what formats, what audio operations (changing duration, pitch, volume, filters, ...).
4. Video files - what formats, what video operations (resize, effects, drawing overlaid shapes, animating elements over etc).
Windows application would be done with Electron (Node.js graphical application development framework) with bundling two of the best libraries e.g. ImageMagick for image manipulations and FFMPEG for all video&audio operations. Text functions would be implemented with existing Node modules based on requirements.
When you have more detailed specifications (or I can write them based on the above) do message me.
Otherwise I'm a webmaster and developer for 26 years, scripting web multimedia practically the same time. I often fix incomplete work by other freelancers.
Regards and hope you're safe,
Matt