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
API classes
All except the classes listed in the table given in the topic Disallowed Customization.
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
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