Designer V.2 - Files not backwards compatible with older versions

[gladCOWE]

I use Affinity Designer & have been using V.2 since its release. I own all the programs but only use Designer actively, so I'm not sure if the other Affinity programs also have this. I just recently had a client who had figured this out and reported it back to me, but when trying to open an Affinity V.2 file I gave to them in Affinity V.1, the program didn't open the file at all and gave this message:

This makes sense since V.2 has a lot more features than V.1, however everything that was included in the file I gave was all converted to curves and shouldn't have interfered with anything from V.1. I expected the program to at least try and open the file and anything that it couldn't replicate exactly would just be turned to a raster image or something along those lines. The only possibility I can think of that would conflict with the older Designer version is the layer effects menu I utilized for certain parts of the project, but then when both I and my client copied the entire group from V.2 into an empty art board in V.1, it worked perfectly and nothing was lost or rasterized at all.

Like I said I understand why this system is here in the first place, but at the very least could V.1 attempt to open a file if it recognizes most If not all of the objects and effects? Literally everything within the file itself I tried to open was a curve, the only thing that could have fought with V.1 was the layer effects but even then all of the effects I had used had already existed in V.1. I double checked to be 100% sure and literally nothing was different between Designer V.1 & 2:

There shouldn't be any reason for Designer V.1 to reject my new file at all. It's one thing If I used effects and features now exclusive to V.2, but I didn't and what I did use had already existed in V.1, it just got carried over.

[Komatös]

Hi @gladCOWE

Files generated in V2 are not backward compatible!

[MikeTO]

Here's the official FAQ - you cannot open v2 files in v1.

But you can generally copy and paste from v2 to v1 as long as you're not copying v2-specific features.