Meneermalik, you said : -
"these are files I edited myself and the large part of these come from old recordings or library manuscripts, all in all I have about 6000 in several large ABC files to convert."

I'm dying to know which library MSs you're talking about and where they are located, as we at the village music project are in the same line work in that case, and would be very happy to add a reference to your MSs in our database and a link to your ABCs, if we don't already have them. I have a couple of hundred MSs listed, and, like you, we have transcribed several thousand tunes into ABC, freely available to anyone with an interest in that sort of thing, as long as they don't pinch them for resale elsewhere that is, as the encoding is of course copyright.