You'll note that the functions use "dir" (directory) instead of the an abbreviation for folder. This simply reflects that the use of "directory" was in vogue when the PowerBASIC functions were first named.

Create	mkdir, rmdir
Navigate	chdir, chdrive,
Information	curdir$, dir$, dir$ close, diskfree, disksize

Current Directory/Folder
When an application runs, Windows assigns the drive/directory of the EXE as the current folder and drive. PowerBASIC provides several functions to return or change both of these.

Directory and Drive Functions Listing
Here's a simple listing of the directory/drive functions above, with a one-line description of what the function does. Syntax and examples are given in the next section.

• CHDIR - Change the current (default) directory on a given drive
• CHDRIVE - Change the current default drive
• CURDIR$ - Return the current directory for a given drive
• DIR$ - Return a filename that matches the given mask
• DIR$ CLOSE - Force the release the operating system FindNext handle
• DISKFREE - Return the amount of available space of a disk, in bytes
• DISKSIZE - Return the total amount of space on a disk, in bytes
• MKDIR - Create a subdirectory/folder (like the DOS MKDIR command)
• NAME - Rename a file or a directory (like the DOS REN command)
• PATHNAME$ - Parse a path/file name to extract component parts

Directory and Drive Functions Reference
Here's a quick reference of the available array functions, in alphabetical order.

• curdir$ - returns current directory pathname

      result$ = curdir$       ' current directory for default drive
      result$ = curdir$ "d"   ' each drive has a current directory
      

  Full path, including drive, is returned.

• dir$ - returns matching file/folder names

      result$ = dir$("*.bas")     ' 1st file with .bas extension
      result$ = dir$("d:\*.txt")  ' file not in current folder
      result$ = dir$              ' next file with last mask
  
      result$ = dir$("*.bas", %Hidden+%System)  'normal/hidden/system
      result$ = dir$("*.bas", ONLY %Hidden)     'normal/hidden/system
      result$ = dir$("*.bas", %SubDir           'directories only
      result$ = dir$("d", %VLabel         'volume label, ignores mask
  
      ONLY Values - (use #INCLUDE "Win32API.inc" in source code): 
                    %NORMAL  (0)    %SYSTEM  (4)   %SUBDIR  (16)
                    %HIDDEN  (2)    %VLABEL  (8)
  
      Dim x As DirData              ' see below for DirData explanation
      a$ = DIR$("*.txt", TO x)      ' attributes put in x
      

  attrib$ operation is to return normal files and filenames with specific attributes. Use ONLY to exclude normal files.

  To get volume label, mask must include drive letter. If path entered, only 1st character is used.

  When result$ = "", there are no more matching filenames.

  The following data type is built into PowerBASIC.

       TYPE DirData
        FileAttributes        AS DWORD
        CreationTime          AS QUAD
        LastAccessTime        AS QUAD
        LastWriteTime         AS QUAD
        FileSizeHigh          AS DWORD
        FileSizeLow           AS DWORD
        Reserved0             AS DWORD
        Reserved1             AS DWORD
        FileName              AS ASCIIZ * 260
        ShortName             AS ASCIIZ * 14
      END TYPE
      

• dir$ close - release FindNext handle

      DIR$ CLOSE        ' no arguments
      

• diskfree - returns available space (bytes)

      Result&& = DiskFree        ' default drive
      Result&& = DiskFree("d")   ' drive d:
      

• disksize - returns total size of disk (bytes)

      Result&& = DiskFree("")    ' default drive
      Result&& = DiskFree("d")   ' drive d:
      

• chdrive - change default drive

      CHDRIVE "d"     ' changes current drive to d:
      CHDRIVE "c:"    ' colon is optional
      

• chdir - change default directory of current drive

      chdir "\download"        ' absolute path
      chdir "..\newfolder"     ' relative location
      chdir "d:\data"          ' sets default directory of drive d:
                               ' current directory is not changed!
      

  Directory can be absolute or relative. Does not change the current default drive.

• mkdir - create folder

      mkdir "c:\data"      ' creates folder in specific path
      mkdir "newfolder"    ' creates folder below current folder
      

  The folder must NOT exist and it's parent folder MUST exist.

• rmdir - removes folder

      rmdir "temp"         ' remove temp folder below current folder
      rmdir "c:\download"  ' removes folder with specific pathname
      

  The folder must be empty! Directory cannot be the current directory.

If you have any suggestions or corrections, please let me know.