I was excited to learn about the new Xcelsius SP4 update and finally moved up. On a few projects I migrated without any issues but found out relatively quickly that there is no backwards compatibility between SP3 and SP4.

In other words, once you save a SP4 XLF, there is no way to open it up in SP3. Xcelsius notifies you that the XLF belongs to a newer version and then stops you from moving forward.

I wanted to notify the development community so you are educated during you migration process and don’t end up in a situation like i was this morning.

With that said, if you are aware of this and can get customers to upgrade, it would be a good idea.

Click here for all of the details at EverythingXcelsius.


I figured out a way to open SP4 XLF in SP3, since I absolutely did not want to do the same work twice.

1. Open your XLF with WinRar or convert the XLF to ZIP and open with what ever zip editor you use.
2. Open up the “document.xml” file and change the version attribute to “5.3”.
3. Save the file
4. Now you can open it back in SP3.

If you use specific SP4 functionality it probably will break things but in my case I hit preview and everything worked but my background image. Make sure you backup your XLF before doing any of this.

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