Hello,
I have extensive experience in .Net (C#), working in the software development industry for more than five years i have worked on developing complex applications in almost all areas e.g. Desktop apps, web apps, web services, WPF, WCF, Web API etc.
Decompilation
The provided program will be decompiled and source code will be extracted in order to do the desired modifications to it. I already know a mechanism of loading .Net EXEs and extracting code from it and exporting the code directly to a Visual studio project which becomes compileable again.
Modifications
The required modifications will be done in the project after decompilation, so that the program will be capable of taking a text file as input. The resultant EXE will be delivered with in the mentioned timeline (With source code). PM for further discussion.
Thank You