# Recompile app as 64 bit

**URL:** <https://mapwindow.discourse.group/t/recompile-app-as-64-bit/932>\
**Category:** Uncategorized\
**Created:** [March 9, 2021, 5:12pm UTC](https://mapwindow.discourse.group/t/recompile-app-as-64-bit/932 "2021-03-09T17:12:13Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Vadym](https://avatars.discourse-cdn.com/v4/letter/v/8baadc/32.png) [@Vadym](https://mapwindow.discourse.group/u/Vadym)\
**Post date:** [March 9, 2021, 5:12pm UTC](https://mapwindow.discourse.group/t/recompile-app-as-64-bit/932/1 "2021-03-09T17:12:14Z")

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Dear sirs

I developed some C# 32 bit application based on your MapWinGIS.ocx component.  
It works well.  
Now I have some reasons to recompile it to 64 bit application.  
I tried to do it on another computer where installed 64-bit MapWinGis.  
Failed to do it. One of the reasons is absence of AxInterop.MapWinGIS.dll that I should have reference to. Could you give me a clue what should I do in order to recompile my application as 64 bit one?

Best regards  
Vadym

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**Author:** ![pmeems](https://yyz2.discourse-cdn.com/free1/user_avatar/mapwindow.discourse.group/pmeems/32/9_2.png) [@pmeems](https://mapwindow.discourse.group/u/pmeems)\
**Post date:** [January 5, 2022, 10:42am UTC](https://mapwindow.discourse.group/t/recompile-app-as-64-bit/932/2 "2022-01-05T10:42:51Z")

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Sorry for this late reply. We completely missed your question.  
When you download the x64-bit version of [MapWinGIS v5.3](https://github.com/MapWindow/MapWinGIS/releases) the correct `AxInterop.MapWinGIS.dll` is shipped.  
It should be in the folder where you installed MapWinGIS.

Please let me know if this solves your issue.

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**Author:** ![Vadym](https://avatars.discourse-cdn.com/v4/letter/v/8baadc/32.png) [@Vadym](https://mapwindow.discourse.group/u/Vadym)\
**Post date:** [January 5, 2022, 11:28am UTC](https://mapwindow.discourse.group/t/recompile-app-as-64-bit/932/3 "2022-01-05T11:28:44Z")

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Dear Paul

Thank you very much for your response.  
Soon I’ll be recompiling my application and then I’ll ask you in case problems arise if you do not mind.

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**Author:** ![pmeems](https://yyz2.discourse-cdn.com/free1/user_avatar/mapwindow.discourse.group/pmeems/32/9_2.png) [@pmeems](https://mapwindow.discourse.group/u/pmeems)\
**Post date:** [February 2, 2022, 9:20am UTC](https://mapwindow.discourse.group/t/recompile-app-as-64-bit/932/4 "2022-02-02T09:20:38Z")

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