1. A system, comprising: a processor; and a memory storing a program executable by the processor to perform an operation comprising: responsive to receiving a request to check-out a file stored in a content repository, determining a file format of the file; upon determining that the file format does not support storing desired metadata within the file, storing, in a file system fork associated with the file, information identifying a location of the file in the content repository, wherein the file system fork is of a format specific to a specified file system; sending the file to a requesting client; designating the file as checked-out from the content repository; and responsive to receiving a request to check-in the file, automatically identifying the location of the file in the content repository, based on the stored information.