X++ code to browse only Excel File type in browser from AX365 form:

** Need to create a class and extend the FileUploadTemporaryStorageStrategy class.

/// <summary>
/// File upload strategy for Excel files.
/// </summary>

class ExcelFileUploadTemporaryStorageStrategy extends FileUploadTemporaryStorageStrategy
{
    public str allowedFileTypes()
    {
        return ".xlsx,.xls";
    }

}


** Add this class as parameter in FileUploadTemporaryStorageResult class.


FileUploadTemporaryStorageResult result = File::GetFileFromUser(classStr(ExcelFileUploadTemporaryStorageStrategy)) as FileUploadTemporaryStorageResult;