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<link xref="nautilus-file-properties-basic">properties</link> window.</p>
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<p>When you rename a file, only the first part of the name of the file is
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selected, not the file extension (the part after the "."). The extension
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normally denotes what type of file it is (e.g. <file>file.pdf</file> is a PDF
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document), and you usually do not want to change that. If you need to change
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the extension as well, select the entire file name and change it.</p>
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selected, not the file extension (the part after the <file>.</file>). The
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extension normally denotes what type of file it is (e.g. <file>file.pdf</file>
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is a PDF document), and you usually do not want to change that. If you need
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to change the extension as well, select the entire file name and change
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<p>If you renamed the wrong file, or named your file improperly, you can
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<section id="valid-chars">
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<title>Valid characters for file names</title>
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<p>You can use any character except the <key>/</key> (slash) character in
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<p>You can use any character except the <file>/</file> (slash) character in
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file names. Some devices, however, use a <em>file system</em> that has more
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restrictions on file names. Therefore, it is a best practice to avoid the
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following characters in your file names: <key>|</key>, <key>\</key>,
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<key>?</key>, <key>*</key>, <key><</key>, <key>"</key>, <key>:</key>,
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<key>></key>, <key>/</key>.</p>
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following characters in your file names: <file>|</file>, <file>\</file>,
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<file>?</file>, <file>*</file>, <file><</file>, <file>"</file>,
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<file>:</file>, <file>></file>, <file>/</file>.</p>
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<note style="warning">
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<p> If you name a file with a <key>.</key> as the first character, the file
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will be <link xref="files-hidden">hidden</link> when you attempt to view
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it in the file manager.</p>
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<p>If you name a file with a <file>.</file> as the first character, the
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file will be <link xref="files-hidden">hidden</link> when you attempt to
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view it in the file manager.</p>