.WZMUL File Extension
What is a WZMUL file?
Registration file used to register WinZip, a popular compression utility for Windows; may be downloaded from the WinZip website after purchasing a WinZip license; opening the WinZip.wzmul file initiates the WinZip registration process.
After the program has been registered, the file should be placed in the Windows Common Application Data folder. In Windows XP, the location is:
C:\Documents and Settings\All Users\Application Data\WinZip.
In Windows Vista, the location is: