Create Custom content type with Custom fields supporting creation of multiple types of documents (.doc, .xls, .ppt) in MOSS

At times, we may have a requirement where in we need to create different type of documents (Word - .doc/.docx , Excel - .xls/.xlsx, Powerpoint - .ppt/.pptx) in a single document library.

So we need to follow the below mentioned steps:

1. Create the required custom fields.

<Field ID="{2B333B0C-05E6-4576-A49E-8713CD6F3FA6}" Name="Field1"     DisplayName="Field1" Type="User" Required="FALSE" Indexed="TRUE" ShowInNewForm="TRUE" ShowInEditForm="TRUE" ShowInDisplayForm="TRUE"

Group="Other Columns" >

    <Formula>=Author</Formula>

    <FieldRefs>

      <FieldRef Name="Author"/>

    </FieldRefs>

</Field>

<Field ID="{B8DEEF8E-54AA-4ad9-9AC7-115AC936228E}" Name="Field2"

 DisplayName="Field2" Type="Choice" Required="FALSE" Indexed="TRUE"  ShowInNewForm="TRUE"  ShowInEditForm="TRUE" ShowInDisplayForm="TRUE"

Group="Other Columns" >

    <CHOICES>

      <CHOICE>void</CHOICE>

    </CHOICES>

</Field>

and so on......

2. Create custom content types with the required custom fields.

<!--Generic content type inherited from document content type containing all the fields-->

<ContentType  ID="0x01010D" Name="CustomDocLibWrkspcCT" Group="Document Content Types" Description="Create a document for the document library" Version="0">

  <FieldRefs>

    <FieldRef ID="{2B333B0C-05E6-4576-A49E-8713CD6F3FA6}"  Name="Owner"Required="FALSE" ShowInNewForm="TRUE" ShowInEditForm="TRUE"ShowInDisplayForm="TRUE"/>

    <FieldRef ID="{B8DEEF8E-54AA-4ad9-9AC7-115AC936228E}" Name="Entity"Required="FALSE"   ShowInNewForm="TRUE" ShowInEditForm="TRUE"ShowInDisplayForm="TRUE"/>

  </FieldRefs>

  <XmlDocuments>

     <XmlDocumentNamespaceURI="http://schemas.microsoft.com/sharepoint/v3/contenttype/forms">

        <FormTemplatesxmlns="http://schemas.microsoft.com/sharepoint/v3/contenttype/forms">

          <Display>DocumentLibraryForm</Display>

          <Edit>DocumentLibraryForm</Edit>

          <New>DocumentLibraryForm</New>

        </FormTemplates>

      </XmlDocument>

    </XmlDocuments>

</ContentType>

<!--Content types inherited from above created document content type-->

<ContentType  ID="0x01010D0089A4ED8153C04980A6CC1DB53EFA85A9"

       Name="Word Document" Group="Document Content Types"

       Description="Create a word document for the document library"

       Version="0">

    <FieldRefs></FieldRefs>

  </ContentType>

<!--Content type for Excel document-->

<ContentType DocumentTemplate="122" ID="0x01010D00A09D2732961C4ffe822B33F30117D24F" Name="Excel Document"Group="Document Content Types" Description="Create an excel document for the document library" Version="0">

    <DocumentTemplate TargetName="/_cts/Excel Document/MyTemplate.XLSX" />

    <FieldRefs></FieldRefs>   

</ContentType>

<!--Provision the document template in system content types virtual folder-->

<Module Name="XLSTemplates" Url="_cts/Excel Document" RootWebOnly="TRUE"Path="XLSTemplates" >

    <File Url="MyTemplate.XLSX" Type="Ghostable" />

</Module>

<!--Content type for PowerPoint document-->

<ContentType DocumentTemplate="123"ID="0x01010D0036A1687A93B8415fAE51C38676BACD9F" Name="PowerPoint Document"Group="Document Content Types" Description="Create a powerpoint document for the document library" Version="0" >

<DocumentTemplate TargetName="/_cts/PowerPoint Document/MyPptTemplate.PPTX" />

    <FieldRefs></FieldRefs>  

</ContentType>

<!--Provision the document template in system content types virtual folder-->

<Module Name="PPTTemplates" Url="_cts/PowerPoint Document" RootWebOnly="TRUE"Path="PPTTemplates" >

    <File Url="MyPptTemplate.PPTX" Type="Ghostable" />

</Module>

Note: The templates for these files are uploaded at the locationhttp://minus.com/mtomNJw23

3. Attach these content types to the document library.

In the schema.xml file of the custom document library, within the <ContentTypes> tag, attach the content types created above

<ContentTypes>                 

      <ContentTypeRef ID="0x01010D0089A4ED8153C04980A6CC1DB53EFA85A9">

        <Folder TargetName="Forms/Document"/>

      </ContentTypeRef>

      <ContentTypeRef  ID="0x01010D00A09D2732961C4ffe822B33F30117D24F">

        <Folder TargetName="_cts/Excel Document"/>

      </ContentTypeRef>

      <ContentTypeRef ID="0x01010D0036A1687A93B8415fAE51C38676BACD9F">

        <Folder TargetName="_cts/PowerPoint Document"/>

      </ContentTypeRef>

      <ContentTypeRef ID="0x0120" />

</ContentTypes>