by Allen Wyatt
(last updated July 2, 2012)
By default, Word uses a DOC extension for all document files. You can, however, control exactly what extensions Word uses with your documents. (Some people prefer their own file name extensions as a means of organizing their documents.) If you try to use a different file name extension by including it when you save the file, Word still appends the DOC extension. For instance, if you explicitly save a file as MyFile.let, Word will still save it as MyFile.let.doc.
If you don't want Word to do this, then simply enclose your file name in quotes when you save under a new name. Thus, you would use the name "MyFile.let" (with the quotes) and that is the file name that Word will use.
As a side note, you should understand that Windows doesn't have length limits on file name extensions. Thus, you can name a document as MyFile.let, or you can name it as MyFile.letter. It is entirely up to you.
One other point on this topic, as well. If you save a document with a different extension (not using DOC), then Word won't show the document by default when you use the Open command. To see all your varied-extension files, you need to follow these steps:
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