No. If you saved a file in FLA, you compile it. In order to perform modification to it, you need to use a decompiler first. In this matter, I suggest to use the Software Informer's database to find a program that you can use. After you decompiled the FLA file, you can open and edit it using Adobe Flash. It doesn't matter what version of the program you use.
To be noticed that you can use flash objects to create your website using CoffeeCup Web Form Builder.