openfiledialog.Filter を使用すると、問題が発生します。これが私のコードです：
openFileDialog1.Filter = "Video and Music Files (*.asf, *.wma, *.wmv, *.wm, *.asx, *.wax, *.wvx, *.wmx, *.wpl, *.dvr-ms, *.wmd, *.avi, *.mpg, *.mpeg, *.m1v, *.mp2, *.mp3, *.mpa, *.mpe, *.m3u, *.mid, *.midi, *.rmi. *.aif, *.aifc, *.aiff, *.au, *.snd, *.wav, *.cda, *.ivf, *.wmz, *.wms, *.mov, *.m4a, *.mp4, *.m4v, *.mp4v, *.3g2, *.3gp2, *.3gp, *.3gpp, *.aac, *.adt, *.adts, *.m2ts)|*.asf *.wma *.wmv *.wm *.asx *.wax *.wvx *.wmx *.wpl *.dvr-ms *.wmd *.avi *.mpg *.mpeg *.m1v *.mp2 *.mp3 *.mpa *.mpe *.m3u *.mid *.midi *.rmi *.aif *.aifc *.aiff *.au *.snd *.wav *.cda *.ivf *.wmz *.wms *.mov *.m4a *.mp4 *.m4v *.mp4v *.3g2 *.3gp2 *.3gp *.3gpp *.aac *.adt *.adts *.m2ts|All Files (*.*)|*.*"