Customization > Windchill+ Guidelines and Guardrails > Allowed Customization
Allowed Customization
The following table lists the elements that are allowed for use in customization. However, it is your responsibility to manage the customized files.
Element
Details
Windchill classes
Extensions are allowed for all Windchill classes, except the ones listed in Disallowed Customization.
Java packages
The following packages are allowed for use in customization. However, only a few classes and methods from these packages are allowed. For more information, see Allowed Classes in Java Packages.
• java.io
• org.json
• java.net.http
• java.net
• java.security
• java.nio
• javax.net.ssl
* 
The java.nio.MappedByteBuffer class in the java.nio package is disallowed for use in customization. Other classes from this package are allowed.
Third-party jars
• org.apache.olingo-odata-commons-api.jar
• org.apache.olingo-odata-server-api.jar
• openpdf.jar
• commons-lang3.jar
• commons-collections4.jar
• json.jar
OOTB file-based configurations provided by PTC
* 
Never overwrite the OOTB files. Always create a copy of the file and then modify it. However, the following files are an exception, you can overwrite them.
• codebase/com/ptc/coversheet/basic/tpl/ddxDirective.xml
• codebase/com/ptc/windchill/enterprise/nativeapp/msoi/client/xml/wtDesktop.xml
• codebase/com/ptc/windchill/enterprise/nativeapp/msoi/client/xml/wtOffice.xml
• codebase/com/ptc/windchill/enterprise/nativeapp/msoi/client/xml/wtWindows.xml
• codebase/com/ptc/windchill/enterprise/nativeapp/msoi/server/msoimap.xml
• conf/auditing/configAudit.xml
• conf/securityLabelsConfiguration.xml
• codebase/com/ptc/arbortext/windchill/serviceEffectivityFilter/server/serviceEffectivityConfig.xml
• codebase/com/ptc/core/collectionsrv/config/SampleConfigurableLinksCollectionExecutionOrder.xml
• codebase/com/ptc/core/collectionsrv/config/SampleConfigurableLinksCollectionDefinitions.xml
• codebase/pickerAttributes.xml
• codebase/registry/ixb/handlers/actor.xml
• codebase/com/ptc/arbortext/windchill/siscore/attset/xml/localizable_attset.xml
• codebase/com/ptc/odata/core/odata.properties
• conf/exposedSecurityLabelObjects.xml
• conf/downloadAcknowledgementTypes.xml
• codebase/com/ptc/arbortext/windchill/publisher/update/overridable_ruleset.xml
• codebase/com/ptc/arbortext/windchill/siscore/attset/xml/publishable_attset.xml
• codebase/com/ptc/arbortext/windchill/siscore/attset/xml/referencedobjects_attset.xml
• codebase/com/ptc/arbortext/windchill/siscore/attset/xml/publishinfo_attset.xml
• codebase/com/ptc/arbortext/windchill/siscore/attset/xml/manifest_attset.xml
• codebase/config/urlValidators/custom-validators.xml
• codebase/registry/ixb/mapping/IXMappingConfiguration.xml
• codebase/config/mvc/custom.xml
Outbound HTTPS calls
HTTPS calls to external systems
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