.DLL

.DLL file extension

This is the basic program to work with .DLL extension

Windows Media Player

Windows Media PlayerApplication Extension

Many people would agree that Windows Media Player has proven to be one of the most reliable and convenient tools to manage one's media library. There is a lot it can do: organize your files, play videos and music, burn CDs, stream your media to other devices... the list of features is very large and very impressive... (more)

The program works with the following extensions: wmv, mkv, mp3, mp4, ifo, avi, vob, dat, wma, flv, rp, rt, rv, mov, wv, au, qt, ts, aa, ra, wm, rm, tp, rpm, mod, wms, m1a, mp2, mka, cdg, m4a, vg2, axa, wmx, aif, m4v, mp1, axv, wmz, ape, dvd, mpa, mts, uis, wpl, mpc, mpv, wmp, mpe, ogg, wvx, asf, mqv, anx, ogm, vfm, 3g2, asx, pls, mpg, spx, esv, 3gp, m2t, mps, cda, smi, rnx, rmi, xpl, m2a, snd, m4e, ivf, m1v, bin, dsf, wav, aac, msv, m2v, mmv, wax, ram, ac3, m2p, m3u, dts, dff, cel, mid, flx, rmm, flc, k3g, ogv, wmd, fli, m2ts, mp2v, aifc, aiff, mpeg, mpga, mpv2, 3gp2, 3gpp, smil, divx, flac, midi, rmvb, xldap, 3gpp2, hdmov, ratdvd, dvr-ms and audiocd

.DLL extension is also supported by the following programs:

NUnit

NUnitApplication Extension

NUnit is a unit-testing framework for all .Net languages.
NUnit-Net-2.0

NUnit-Net-2.0Application Extension

CorelDRAW Graphics Suite

CorelDRAW Graphics SuiteApplication Extension

Design graphics and layouts, edit photos, and create websites.
WinRAR

WinRARApplication Extension

Compress files in RAR and ZIP with faster compression speed and file recovery.
Yahoo! Mail

Yahoo! MailApplication Extension

Windows Essentials Codec Pack

Windows Essentials Codec PackApplication Extension

It's easy to use and even easier to install/uninstall.