The mmioInstallIOProc function installs or removes a custom I/O procedure. This function also locates an installed I/O procedure, using its corresponding four-character code.

More info on mmioInstallIOProcW in Windows Dev Center

Exported by

sizefilenameversion
126056winmm.dll6.3.9600.17415 (winblue_r4.141028-1500)
104960winmm.dll1.0.0.0
88576winmm.dll1.0.0.0
245408unicows.dll1.0.4018.0
258352unicows.dll1.1.3790.0

Imported by

sizefilename
110592NvdUpd.exe
349334D0110109.PDF.exe
126056winmm.dll
245408unicows.dll
229376E310688FB4B9AE14D1FB5257F93F3354
258352unicows.dll