Load All Files From Folder - Assumes each file contains one column of numbers

#pragma rtGlobals=3     // Use modern global access method and strict wave access.

Menu "Load Waves"
    "Load All Files From Folder", LoadAllFilesFromFolder("", ".txt")
End
 
//  LoadAllFilesFromFolder(pathName, extension)
//
//  This function loads each file in a given file folder into Igor as general text.
//  NOTE: Each file is assumed to contain one column of numbers.
//
//  pathName is the name of an Igor symbolic path or "" to get a dialog.
//  The name of each data file is assumed to end with the specified file name extension.
//  The output wave name is the file name less the extension.
//
//  NOTE: You may need to change the LoadWave command to fit your file format.
//  Use Data->Load Waves->Load Waves to find the right command and then adjust the LoadWave command below.
 
Function LoadAllFilesFromFolder(pathName, extension)
    String pathName             // Name of an Igor symbolic path or "" to get a dialog
    String extension                    // File name extension - e.g., "txt" or ".dat"
 
    if (strlen(pathName) == 0)
        NewPath/O/M="Choose a folder containing data files" DataFilesPath
        if (V_flag != 0)
            return -1               // User cancelled
        endif
        pathName = "DataFilesPath"
    endif
   
    Variable numFilesLoaded = 0
 
    String fileName
    Variable index
 
    index = 0
    do
        fileName = IndexedFile($pathName, index, extension)
        if (strlen(fileName) == 0)
            break           // No more files.
        endif
 
        String wName = ParseFilePath(3, fileName, ":", 0, 0)    // Remove extensions
        wName = CleanupName(wName, 0)                   // Make legal standard Igor wave name
        Variable existsCode = exists(wName)
        if (existsCode!=0 && existsCode!=1)
            // wName conflicts with some name other than a wave name so make it unique
            wName = UniqueName(wName, 1, 0)
        endif
 
        String columnInfoStr
        sprintf columnInfoStr, "N='%s';", wName
 
        LoadWave/G/D/P=$pathName/A/O/B=columnInfoStr/Q fileName
        Wave w = $wName         // Create a wave reference
        // Do something with w if you wish
 
        numFilesLoaded += 1
        index += 1
    while (1)
   
    Printf "Loaded %d files\r", numFilesLoaded
End