The X
按字母分类：
extension name file type Classification
U AU Audio File audio file
U8 3D Lemmings Audio File audio file
UAX Unreal Audio Package audio file
UB Unsigned Byte Audio File audio file
ULAW Raw u-Law Audio File audio file
ULT UltraTracker Module audio file
ULW u-Law Audio File audio file
UNI MikMod UniMOD Module audio file
USF Nintendo 64 Music File audio file
USFLIB Nintendo 64 Song Library audio file
UST UTAU Sequence Text File audio file
UW Unsigned Word Audio File audio file
UWF UltraTracker Wave File audio file