You could have downloaded AcFolders 1.5 from our software library for free. The most popular version among AcFolders users is 1.5. AcFolders is categorized as System Utilities. The actual developer of the program is SVAr soft. Acfo.exe is the most common filename for this program's installer.
From the developer:
How often do you use Open-Save dialog boxes? It is time to enhance these with AcFolders. It has useful, additional tools, like categorized bookmarks, a file search tool (embedded directly to the dialog box), and a file/folder recall tool. Supported is Drag and Drop - just drop your favorite folder to the toolbar in the selected category.
You may want to check out more software, such as Pattern Lab for Proteomics, which might be related to AcFolders.