Systems, methods, and computer program products to perform an operation comprising receiving, from an application executing on a system, a request to access a data file, wherein the data file is referenced by a variable name in a source code of the application, receiving data describing the request, wherein the data describing the request is obtained from a runtime stack of the application and includes a name of the application and a name of the data file, wherein the name of the data file is used as a value for the variable name, and storing an indication that the application accessed the data file in a cross-reference data store for the system.