Unable to open Project - "Failed to open project. Check it is a valid Construct 3 folder project."

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- Anthracite
- - Joined 30 Dec, 2016
  - 74 topics • 160 posts
- 1
- 20 Jul, 2022
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Hi there, hoping somebody can help here ...

I have a project that was saved in 303 (the beta). However, I need to be opened in 302 (stable). I do the usual editing of the C3PROJ file (as I have done many times before) and it gives me this error.

The Console shows this ...

What do I need to do to be able to open the project in 302 (the stable version) as I've never encountered this before.

The odd thing is that if I open the edited file under r303, it opens fine. But just doesn't open in 302
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- Ashley Construct Team Founder
- Moderator
- - Joined 21 May, 2007
  - 669 topics • 30,350 posts
- 1
- 20 Jul, 2022
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Project files are not actually backwards compatible with older Construct releases. If you manually edit the file to open in an older release it may or may not work. In this case it does not work.
- Anthracite
- - Joined 30 Dec, 2016
  - 74 topics • 160 posts
- 1
- 20 Jul, 2022
- Quote
Thank you Ashley, appreciate you taking the time out to respond.

There are no new features I'm using whatsoever in this version and as such I'm baffled as to why it's no longer opening. Is there any solution at all ?
- Anthracite
- - Joined 30 Dec, 2016
  - 74 topics • 160 posts
- 1
- 20 Jul, 2022
- Quote
As an update, changing

"exportFormat": "lossless",

to

"exportFormat": "png",

Fixes the issue.
- Ashley Construct Team Founder
- Moderator
- - Joined 21 May, 2007
  - 669 topics • 30,350 posts
- 1
- 21 Jul, 2022
- Quote
We sometimes make internal changes to the project file format, and we make sure it's backwards compatible, but it is not forwards compatible. This is why you can never guarantee a project will open in an older release and why it's not something that is officially supported. Some people have got in to the habit of working around that by modifying the project file directly, but as you've found, sometimes that just won't work, because it's not actually supported.