Create a windows service that wil automatically download an excel file and make modifications to it

Avg Bid (USD)
Project Budget (USD)
$30 - $9999

Project Description:
I need to have an interface were I can set a scheduler for different files to be downloaded to different directorys. The files will be reffered with their URL
The file downloaded is an Exel file.
Inside the Excel I need minor chnages like:
1. Change sheet name
2. Replace some text or characters in columns

The old file will be copied to an history directory and will be renamed with the date.
In the main directory the file will be overwritten and replaced.

In the history directory files will be kept for last 30 days.

Skills required:
.NET, ASP, PHP, Software Architecture
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