How filter files in folder?

Getting Started
1

Hi all,
I would like to know how to filter files in a folder to show only a certain type of files (eg *.pdf, *.ico, *.log, etc.)?
Do I need to add a “File Type Group” with the extensions that interest me?
Is filtering files by Type (folderitem.Type) or by Extension the same thing?
Here is a basic example of code to adapt:

Var DeskFiles As FolderItem = SpecialFolder.Desktop
For Each Deskfile As FolderItem In Files.Children
  Listbox1.AddRow(file.Name)
Next
2

Use an IF inside the loop, check desired properties, like IsFolder, or Type if you defined some in the project, or analyze the Name, skip or process accordingly your desired matches.

4 
Var matches() As String
Var matchingTypes As String = "jpg/jpeg/png/gif/tif/tiff/htm/html/" // lower case, every extension ends with /

Var files As FolderItem = SpecialFolder.Desktop

For Each file As FolderItem In files.Children
  
  If not file.IsFolder Then // Only files
    
    Var getNameType() As String = file.Name.Split(".")
    Var nameType As String = ""
    If getNameType.LastIndex > 0 Then nameType = getNameType(getNameType.LastIndex).Lowercase // nametype = "jpg", "txt", etc
    
    If nameType > "" And matchingTypes.IndexOf(nameType+"/") >= 0 Then
      matches.Add file.Name // lets get only matching file extensions listed
    End
    
  End
  
Next

Break // here are the matches()