Producing a Dialog Box for Selecting a Format for Saving
You might want an application to save existing waveform-audio data in another format. For example, a waveform-audio editor could save a waveform-audio file as a compressed file. To list only the suggested destination formats for a specified source format in the dialog box created by the acmFormatChoose function, specify the source format in the pwfxEnum member and the ACM_FORMATENUMF_SUGGEST flag in the fdwEnum member of the ACMFORMATCHOOSE structure.
Similarly, to list valid destination formats for a specified format, use the ACM_FORMATENUMF_CONVERT flag instead of the ACM_FORMATENUMF_SUGGEST flag.