```
If you build
---
### Author:  [@mh](https://talk.remobjects.com/u/mh)
#### Post date: [October 18, 2022, 3:50pm UTC](https://talk.remobjects.com/t/using-a-frameworkz-reference-with-the-core-compiler/27367/8 "2022-10-18T15:50:15Z")
Ah yeah, its _creating_ the .frameworkz that fails, not extracting it. reproduced and will investigate.
---
### Author:  [@mh](https://talk.remobjects.com/u/mh)
#### Post date: [October 18, 2022, 4:08pm UTC](https://talk.remobjects.com/t/using-a-frameworkz-reference-with-the-core-compiler/27367/9 "2022-10-18T16:08:08Z")
Ah yes. like everything on .NET Core, this needs a separate package to be explicitly referenced and registered to get functionality that was commonly available everywhere in classic .NET. Should be fixed, pending testing when I have a new build.
---
### Author:  [@JohnMoshakis](https://talk.remobjects.com/u/JohnMoshakis)
#### Post date: [October 18, 2022, 5:15pm UTC](https://talk.remobjects.com/t/using-a-frameworkz-reference-with-the-core-compiler/27367/10 "2022-10-18T17:15:24Z")
Thanks. Are you going to use System.IO.Compression.ZipFile ?
---
### Author:  [@mh](https://talk.remobjects.com/u/mh)
#### Post date: [October 18, 2022, 5:38pm UTC](https://talk.remobjects.com/t/using-a-frameworkz-reference-with-the-core-compiler/27367/11 "2022-10-18T17:38:19Z")
Not for now, I simply #ifdef’ed it to use a new way to obtain the IBM347 encoding, in all places that use it:
```auto
#if NETCOREAPP || NETSTANDARD
public readonly static System.Text.Encoding IBM437Encoding = System.Text.CodePagesEncodingProvider.Instance.GetEncoding("IBM437");
#else
public readonly static System.Text.Encoding IBM437Encoding = System.Text.Encoding.GetEncoding("IBM437");
#endif
public readonly static System.Text.Encoding DefaultEncoding = ZipFile.IBM437Encoding;
```
If that doesn’t work, I might look at porting to System.IO.Compression.ZipFile, but there are a few places that use the Ionic.Zip AIs directly, I’m afraid (rather than a platform-specific abstraction as some other places already do), so this would mean rewriting/retesting several places that work with zip files — and i don’t reallyfeel like doing that now, if i don’t need to.
---
### Author:  [@mh](https://talk.remobjects.com/u/mh)
#### Post date: [October 19, 2022, 4:13pm UTC](https://talk.remobjects.com/t/using-a-frameworkz-reference-with-the-core-compiler/27367/12 "2022-10-19T16:13:08Z")
Seems to work.
---
### Author:  [@RemObjectsSoftware](https://talk.remobjects.com/u/RemObjectsSoftware)
#### Post date: [October 19, 2022, 4:13pm UTC](https://talk.remobjects.com/t/using-a-frameworkz-reference-with-the-core-compiler/27367/13 "2022-10-19T16:13:41Z")
[bugs://E26205](https://www.remobjects.com/portal/bugs/?id=E26205) was closed as fixed.
---
### Author:  [@JohnMoshakis](https://talk.remobjects.com/u/JohnMoshakis)
#### Post date: [October 19, 2022, 4:24pm UTC](https://talk.remobjects.com/t/using-a-frameworkz-reference-with-the-core-compiler/27367/14 "2022-10-19T16:24:29Z")
Great. There is a build coming ?
---
### Author:  [@mh](https://talk.remobjects.com/u/mh)
#### Post date: [October 19, 2022, 4:25pm UTC](https://talk.remobjects.com/t/using-a-frameworkz-reference-with-the-core-compiler/27367/15 "2022-10-19T16:25:06Z")
I tested with the last build from yesterday.
---
### Author:  [@JohnMoshakis](https://talk.remobjects.com/u/JohnMoshakis)
#### Post date: [October 19, 2022, 5:23pm UTC](https://talk.remobjects.com/t/using-a-frameworkz-reference-with-the-core-compiler/27367/16 "2022-10-19T17:23:47Z")
Thanks, that worked.
On ios projects it seems like a huge improvement. A full rebuild on my biggest project goes from 9 minutes to 3
---
### Author:  [@mh](https://talk.remobjects.com/u/mh)
#### Post date: [October 19, 2022, 5:57pm UTC](https://talk.remobjects.com/t/using-a-frameworkz-reference-with-the-core-compiler/27367/17 "2022-10-19T17:57:06Z")
> [@JohnMoshakis](#):
>
> On ios projects it seems like a huge improvement. A full rebuild on my biggest project goes from 9 minutes to 3
Wow. just by switching from (I assume you’re on Mac) Mono to .NET Core?
---
### Author:  [@JohnMoshakis](https://talk.remobjects.com/u/JohnMoshakis)
#### Post date: [October 19, 2022, 6:08pm UTC](https://talk.remobjects.com/t/using-a-frameworkz-reference-with-the-core-compiler/27367/18 "2022-10-19T18:08:34Z")
Yes. Its an m1 mac.
---
### Author:  [@mh](https://talk.remobjects.com/u/mh)
#### Post date: [October 19, 2022, 6:37pm UTC](https://talk.remobjects.com/t/using-a-frameworkz-reference-with-the-core-compiler/27367/19 "2022-10-19T18:37:07Z")
That _is_ impressive…