I need a small desktop application that takes an Excel workbook as input, performs a set of internal calculations or data transformations, and then spits out a brand-new Excel file. Everything must run in Python and present a clean, intuitive graphical interface. Here’s what matters to me: • A true GUI—no command line prompts—where I can simply drag and drop the source .xlsx into the window. • While the file is being crunched, a progress bar (or similar indicator) keeps me informed in real-time. • When processing finishes, the program saves the generated .xlsx and lets me pick the destination folder. Under the hood you are free to lean on pandas, openpyxl, xlrd/xlwt, or any other sensible libraries. For the interface, PyQt, Tkinter, or another Python-friendly toolkit is fine as long as the final build runs smoothly on Windows. Deliverables 1. Compiled desktop app (installer or standalone executable) 2. Well-commented source code