SDFAT library- converting from SD

Moving from SD to SdFat lib, I am trying to run the example program “Backwards Compatibility”.
With #define USE_SD_H 0 (using SdFat) I’m getting this error - BackwardCompatibility:24: error: ‘File’ does not name a type
File myFile;
^
and
BackwardCompatibility:48: error: ‘myFile’ was not declared in this scope
myFile = SD.open(“test.txt”, FILE_WRITE);
^
I’m not quite sure why? Sd lib is working fine. File is not a type with SdFat? What needs to be done to fix this?

// A simple read/write example for SD.h.
// Mostly from the SD.h ReadWrite example.
//
// Your SD must be formatted FAT16/FAT32.
//
// Set USE_SD_H nonzero to use SD.h.
// Set USE_SD_H zero to use SdFat.h.
//
#define USE_SD_H 0
//
#if USE_SD_H
#include <SD.h>


#else  // USE_SD_H
#include "SdFat.h"


SdFat SD;
#endif  // USE_SD_H


// Modify SD_CS_PIN for your board.
// For Teensy 3.6 and SdFat.h use BUILTIN_SDCARD.
#define SD_CS_PIN 10


File myFile;


void setup() {
  Serial.begin(9600);
  while (!Serial) {}


#if USE_SD_H
  Serial.println(F("Using SD.h. Set USE_SD_H zero to use SdFat.h."));
#else  // USE_SD_H
  Serial.println(F("Using SdFat.h. Set USE_SD_H nonzero to use SD.h."));
#endif  // USE_SD_H
  Serial.println(F("\nType any character to begin."));
  while (!Serial.available()) {
    yield();
  }
  Serial.print("Initializing SD card...");


  if (!SD.begin(SD_CS_PIN)) {
    Serial.println("initialization failed!");
    return;
  }
  Serial.println("initialization done.");


  // open the file.


  myFile = SD.open("test.txt", FILE_WRITE);


  // if the file opened okay, write to it:
  if (myFile) {
    Serial.print("Writing to test.txt...");
    myFile.println("testing 1, 2, 3.");
    // close the file:
    myFile.close();
    Serial.println("done.");
  } else {
    // if the file didn't open, print an error:
    Serial.println("error opening test.txt");
  }


  // re-open the file for reading:
  myFile = SD.open("test.txt");
  if (myFile) {
    Serial.println("test.txt:");


    // read from the file until there's nothing else in it:
    while (myFile.available()) {
      Serial.write(myFile.read());
    }
    // close the file:
    myFile.close();
  } else {
    // if the file didn't open, print an error:
    Serial.println("error opening test.txt");
  }
}
void loop() {
  // nothing happens after setup
}

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OK thanks I have read the posting info and see the error in my post. Sorry can some help or will i need to repost?

Thanks for adding the code tags. It really does make it easier to examine the code