How do I download my Twitter tweets into a Microsoft file?

Try the Twitter Data Grants (TDG), it allows research institutions to access Twitter’s public and historical data. These publicly available tweets, including the user information/ retweet/replies/mentions, are available in JSON format through Twitter’s provided API. Twitter API allows accessing to both historic and real-time feeds; as for the search API, it allows the query of Twitter for recent Tweets containing specific keywords and requires an authorized application before obtaining any results from the API. While for the streaming API, it allows the filtering of live streaming tweets by many identifiers such as user ID, keyword, geographic location or random sampling.
In order to use this API, users must register with their research project information, then Twitter will provide the project with an application unique ID and then produce set of credentials to access the API. Then the user can use these credentials to setup a connection and query twitter’s tweets database either its historic data or its real-time feeds. Then, after making the connection and running the query through the API, results in JSON format will be retrieved.