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→Filenames
The extension is "pdf", denoting a file in Portable Document Format.
=== Case Sensitivity ===
Some filesystems are case-sensitive, and UPPER- and lower-case letters are considered to be different. For example, the filenames <code>MILK.PDF</code>, <code>Milk.pdf</code>, and <code>milk.pdf</code> refer to three different files. This is the case with most Linux (and Unix-like) filesystems.
Most Windows filesystems are not case-sensitive, so the filesnames <code>MILK.PDF</code>, <code>Milk.pdf</code>, and <code>milk.pdf</code> would refer to the same file.
== Current Directory ''or'' Working Directory ==