Add following line of code in your Plist file to open CSV and PDF file in your application. Please note that UTTypeIdentifier should be unique.

<key>CFBundleDocumentTypes</key>
    <array>
        <dict>
            <key>CFBundleTypeName</key>
            <string>US Presidents File</string>
            <key>CFBundleTypeRole</key>
            <string>Viewer</string>
            <key>LSHandlerRank</key>
            <string>Owner</string>
            <key>LSItemContentTypes</key>
            <array>
                <string>Damian-sss.${PRODUCT&#95;NAME:rfc1034identifier}</string>
                <string>Damian-s.${PRODUCT&#95;NAME:rfc1034identifier}</string>
            </array>
        </dict>
    </array>
    <key>UTExportedTypeDeclarations</key>
    <array>
        <dict>
            <key>UTTypeConformsTo</key>
            <array>
                <string>public.data</string>
            </array>
            <key>UTTypeIdentifier</key>
            <string>Damian-sss.${PRODUCT&#95;NAME:rfc1034identifier}</string>
            <key>UTTypeDescription</key>
            <string>US Presidents File</string>
            <key>UTTypeTagSpecification</key>
            <dict>
                <key>public.filename-extension</key>
                <string>pdf</string>
                <key>public.mime-type</key>
                <string>application/uspresidents</string>
            </dict>
        </dict>
        <dict>
            <key>UTTypeConformsTo</key>
            <array>
                <string>public.data</string>
            </array>
            <key>UTTypeIdentifier</key>
            <string>Damian-s.${PRODUCT&#95;NAME:rfc1034identifier}</string>
            <key>UTTypeDescription</key>
            <string>US Presidents File</string>
            <key>UTTypeTagSpecification</key>
            <dict>
                <key>public.filename-extension</key>
                <string>csv</string>
                <key>public.mime-type</key>
                <string>application/uspresidents</string>
            </dict>
        </dict>
    </array>