I believe Confluence supports images (although I'm not 100% sure which ones, but at least JPEG and PNG), PDF files, and MS Office files (.DOC/DOCX, .XLS/XLSX, .PPT/PPTX).
Strangely text files (.TXT, .CSV) don't seem to be supported.
I think the paragraph https://confluence.atlassian.com/display/DOC/Displaying+Files+and+Images#DisplayingFilesandImages-Embeddingafileinthepage fits its most!
Support for text formats (csv, txt, html) should be implemented...
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