A .exe file programme, to index and record emails, pdf, invoice and scans

Hi I am a very small accountant just setting out. My customers all have a micro turnover I want a programme that I can set up on any windows platform Vista and above, that will drag and drop emails, pdf, photos, excel, and word documents, and accept new scans, and be able to give each file a company name, a date, an amount net, vat, gross indexed and searchable. to be searchable by various criterion a search word or any of the above, and maybe easily changed to add more search terms without having to be reprogrammed. This would all be collated together into a single pdf file or similar recognisable format. I know that acrobat does something similar, but it doesnt quite get to the standard I need as an accountant to be able to present the file to hmrc for easy inspection. I would own the copyright of the programme and the programmer would not be permitted to share it or use it for themselves.