I have a batch converter (ConvIm) but this doesn`t cover DXT3 because of the alpha.
I have done commandline batch converters to do specific conversion jobs but they aren`t posted on the site.
Quickest way with DXTBmp is to drag and drop the files on the window (one at a time), select "Save" and then switch the format. Saves a bit of work anyway
I downloaded ConvimX and the latest mwgfx dlls but it does not run with either double click or right-click/open. Convim works fine. I am using W2000 Sp2.
try downloading the dll pack again. I have just uploaded the latest version to make sure the public version is the same as the one I am using here.
Also do a search on your system to see if you have extra copies of mwgfx.dll lurking about. Windows will load the first one it finds and if this is too old it won`t have the functions convimx needs. The only copy you should have is in your windowssystem32 folder