Before report, my problem is not specific for matroska splitter, but for all filters of the package (I tested all, to see if anyone worked from DSFP 4.11 but I usually only need FLV and MKV, the others are covered by other filters as Haali). Just to leave it clear enough. After that, for the ones you posted, the only one that gives an error is "MatroskaSplitter-1.5.2.3456_(SF).ax". About what you say between the docs and SF site differences, MPC-HC, the application, the player, doesn't run on Windows 2000. Do the filters? Well, as you extract them from it, and I was using them, yes, until 4.11, they worked, and that is because I was happy I found your DSFP. Sadly looks like they started to compile the filters as they do with the player, not allowing to run them on older OSs :/ P.S.: I know there are wrappers (OldCigarettes and BlackWingCat), and I use them for games, but...