The problem you probably ran into was that you used double quotes for your file name. (File extensions probably had nothing to do with it.) Since Windows's path separators are backslashes, and backslashes are a special character inside double quotes, this is many a beginner's stumbling-block. There are two easy fixes: use forward slashes (they work even on Windows), or use single quotes.

In reply to Re^3: file basics by Anonymous Monk
in thread file basics by harry1705

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