The TxtFormatProvider always imports the document with UTF8 encoding. It will be great if users could change this setting in order to import document with different encodings.

Currently there are three places in the UI which contain a list of font sizes which could be applied to the content, and all of them could be customized separately:
- RadRichTextBoxRibbonUI - could be customized by directly editing the content of the ribbon in the XAML file.

- FontPropertiesDialog - could be customized by replacing the whole dialog (as SDK is available: https://github.com/telerik/xaml-sdk/tree/master/RichTextBox/CustomFontPropertiesDialog ), or a little hacky approach using the FindName method:

((ListBox)((Control)this.radRichTextBox.FontPropertiesDialog).FindName("fontSizeListBox")).ItemsSource = new List<double> { 10, 14, 16, 18, 20 };

- SelectionMiniToolBar - could be customized by changing the template of SelectionMiniToolBar

Provide API which allows customization at a single place. This API could be similar to (or even extension of) the already available Telerik.Windows.Document.Layout.FontManager class.

There are a number of Bitmap objects that are not disposed. Changing this behavior could improve the memory usage when exporting PDF documents.

The customers need to customize the dialogs for opening and saving a file. For example, they need to set a default path or extension. With the current implementation, this can be achieved by customizing the commands. Expose an API allowing them to achieve that easily.

Add support for FILENAME field. The field could be evaluated using the last opened/saved file name.

Description:https://support.office.com/en-us/article/field-codes-filename-field-a2946f1b-d822-47dc-ba32-4482aece26bc?ui=en-US&rs=en-US&ad=US

Add support for CREATEDATE field. The field is evaluated using the document metadata.

Description: https://support.office.com/en-us/article/field-codes-createdate-field-440080d1-2d34-494f-bdca-9d451d659d46?ui=en-US&rs=en-US&ad=US

Add support for USERNAME field. The field is evaluated using the document metadata.

Description: https://support.office.com/en-us/article/field-codes-username-field-f564f516-823f-4fb9-9da8-9b6312148053?ui=en-US&rs=en-US&ad=US

In Windows 10 1709 Falls creators update there is an upgrade to Microsoft Edge, with which the copy from edge is changed:

1) no longer it is copied in "Rich Text Format"

2) the "HTML Format" data is formatted differently than before - different line separators and the whole html is placed into a single line (unlike before).

Implement support for the SET field.

The content of a page can be aligned vertically. In DOCX, this is a property of the section and is defined with the vAlign element.

<w:sectPr>
…
<w:vAlign w:val="center" />
</w:sectPr>

Currently, the underline is always exported as single. Add support for the other types that can be used in RadRichTextBox.

Currently, paragraphs that have applied a list style but their list level is set to -1 or another invalid value, cannot be imported due to an ArgumentOutOfRangeException. According to the specification, the scenario is invalid, though, in MS Word and WordPad, similar values are not respected.

The List Override Table contains definitions that override the properties of another list definition.

WMF contains both bitmap and vector elements and currently RTB supports only the bitmap parts. We should consider adding support for the vector elements as well. 

The "initial" CSS keyword applies the initial value of a property to an element. At this point, the result shown in RadRichTextBox can be unexpected as this value is not considered but the style evaluation falls back to the default styles defined for the control and doesn't consider the ones defined in the document style.

For example, setting background-color: initial; always results in black background.

In MS Word, the users can change the alignment of a table using the buttons related to Paragraph alignment. To do that, the whole table must be selected.

In RadRichTextBox, selecting a Table and pressing one of the buttons, let say for Right alignment, leads to aligning the content of the table and not the table itself.

Workaround:
private void RadRichTextBox_CommandExecuting(object sender, CommandExecutingEventArgs e)
{
    if (e.Command is ChangeTextAlignmentCommand &&
        this.radRichTextBox.Document.Selection.Ranges.Count == 1 &&
        this.radRichTextBox.Document.Selection.Ranges.First.RangeType == SelectionRangeType.Table &&
        e.CommandParameter.ToString() != "Justify")
    {
        e.Cancel = true;

        RadDocumentEditor editor = new RadDocumentEditor(this.radRichTextBox.Document);
        RadHorizontalAlignment newAlignment = (RadHorizontalAlignment) Enum.Parse(typeof(RadHorizontalAlignment), e.CommandParameter.ToString());
        editor.ChangeTableHorizontalAlignment(newAlignment);
    }
}

NOTE: With this approach, the toggle buttons in the UI are not updated properly and this should be additionally handled.

Show a preview of how a feature affects the document as the user hovers over the different options in the user interface, e.g.:
- when a style is hovered in the styles gallery, temporarily apply the style to the affected text; 
- when a font size is hovered in the font size combo (in the ribbon or in the SelectionMiniToolBar), temporarily apply the hovered font size to the affected text.

Currently, blockquote tags are imported as paragraphs. Change the mechanism so they can be imported as citations.

When deleting all content (e.g. Select All [CTRL+A] + Delete [Del]) in the document, it would be convenient for the user to preserve all formatting (local span formatting + local paragraph formatting + style) applied on the last paragraph. 

This will ensure that the user will continue edit the document with last current font, font family, etc.

If this operation is applied on an empty document, though, the styling of the single paragraph should be reset to the defaults for the document.

When a table is selected, the SelectionMiniToolbar should have a borders drop down menu which allows setting and editing of borders without entering the table borders dialog.