The Caribbean islands are those islands that border or are surrounded by the Caribbean Sea organized by the political entity to which each island belongs.
A QFX file is a standard OFX file with additional fields to support a licensing fee paid by institutions to Intuit. In contrast, the standard OFX format is a free and open standard.
Xslx is excel work sheet file. It could contains much more than just raw data (chart, formating document, etc...) In case you only need to store raw data(only rows and columns) csv is usually prefered though the size of xlsx is smaller.