Acf extension is related to Microsoft Interface Definition Language (MIDL) IDL file. You can open acf files with Microsoft MIDL.
These are Interface description language (MIDL) programming files which created by Microsoft. Midl language and c programming language have similar features. The projects which created by MIDL are found in IDL and ACF files. If you need to get detailed information about acf files please check the following link.
What to use acf
which page related to acf file
acf Related Searches
You can check related links about acf fileextension.