Hi!
I'm interested in taking hands on this project:
As an ASP.NET/SQL server developer, I can create an application to substitute your current MS Access solution.
* For text file is is very straigforward, and if it's comes formatted (as in csv-comma separated values, it will be easier.
*For xls files there's ClosedXML and other libraries, for pdf we have PDFSharp.
* I am confortable working with Angular JS and understand MS Access to build from to Sql Server.
I will comply with the business logic you required, for this mostlikely more details will be given.
Please let me know if interested, looking forward!
-Sergio