TRIXER creates catalogs of transparent file indexes. A transparent file index is an exact mirror of a directory, except that each of its file is void, thus "taking no space", while apparently having the same size of its indexed counterpart so as to describe it fully. This is accomplished by combining sparse files support with fusecompress on-the-fly compression technology. This is useful for many purposes, e.g. creating a catalog of your CD/DVD-ROM library to browse its contents without having to physically access it. The advantage of this software is that a TRIXER catalog is a plain mountable ext2 filesystem, allowing enhanced interoperability with the huge lot of available software to handle the catalog in a number of ways.