HashCatalog is a program that can find duplicate files in one or more folders or between two lists of one or more folders. HashCatalog supports a regular expression mask to select files to be evaluated for duplicates. HashCatalog will always recurse directories in search of files. HashCatalog can also create an XML file containing a listing of files, along with enough information to be able to determine duplicates. This XML file can be used to allow searches for duplicates against removable media. The catalog can be supplied to the list of search locations, along with individual files and folders. The hash methods supported are: MD5, SHA, SHA1, SHA256, SHA384, and SHA512.