"A list of all available filters, applicable to tasks or resources. Accessed by using the Project..Filtered for..More Filters command. Originally held in GLOBAL.MPT, filters are stored to the local project document once they have been accessed. Existing filters can be edited or new ones can be created within the library. In addition, saved AutoFilter criteria are saved within the filter library as new global filters.
'SOURCE; microsoft project glossary-projectlearning.net"