Lack of forward compatibility v12 to v13?

[Matthew F]

I get the attached error message when I try to open the Assets starter solution made in FMPA v13, in FMPA v12.  

 

At first I assumed that this meant that there was a general lack of forward compatibility between files made in v13 and the v12 app.  However, I don't get this error with other starter solutions, or files made from scratch in v13.

 

Also I can open .FMP12 files created in v12 in v13, add v13-specific features (like Pop-overs) and am still able to open them in FMP v12 (though the pop-over button does not show). 

 

Does any one know what makes certain v13 files incompatible with the v12 app?  

 

 

[hbrendel]

Look in File Options

[pixi]

You can define which version has to be used

[Rick Whitelaw]

I remember when version 10 or 11 (don't remember!) came out and I started implementing features not available in earlier versions, I , after making many important changes that would have made a solution just ugly in previous versions, disabled opening the file in any version less than 10 or 11. Perhaps this particular starter solution has done the same.

[Matthew F]

Yep.  You all are correct!  Thanks.