# Telemac installer erro

**URL:** <https://opentelemac.org/forum/t/telemac-installer-erro/7354>\
**Category:** Windows Version\
**Created:** [August 17, 2023, 6:00am UTC](https://opentelemac.org/forum/t/telemac-installer-erro/7354 "2023-08-17T06:00:17Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![user\_16320](https://opentelemac.org/forum/letter_avatar_proxy/v4/letter/u/35a633/32.png) [@user\_16320](https://opentelemac.org/forum/u/user_16320)\
**Post date:** [August 17, 2023, 6:00am UTC](https://opentelemac.org/forum/t/telemac-installer-erro/7354/1 "2023-08-17T06:00:17Z")

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When I finished istalling, and then opened the Prompt in the Desktop to try telemac2d.py command, but it just opened the telemac2d.py file…

I don’t know what’s going wrong, for I install telemac on another computer using the same steps,but it just run perfect.

Could anyone help me, any help will be very appreciate！

 ![erro.png](https://opentelemac.org/uploads/default/original/2X/7/79dd9b13c31bdd8d7fb51782c0e7d2be71d0b312.png)  
 ![right.png](https://opentelemac.org/uploads/default/original/2X/3/33db7fe8df933f208ef244826fa819147fda6787.png)

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<div class="post-metadata">

**Author:** ![user\_15645](https://opentelemac.org/forum/letter_avatar_proxy/v4/letter/u/eb9ed0/32.png) [@user\_15645](https://opentelemac.org/forum/u/user_15645)\
**Post date:** [September 13, 2023, 7:46pm UTC](https://opentelemac.org/forum/t/telemac-installer-erro/7354/2 "2023-09-13T19:46:10Z")

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Hello,

It seems that your .py files are associated with Notepad. To remove this association, you need to open the Windows registry, and go to the following key:

```auto
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.py

```

There, you should find a key named “UserChoice”, which you need to delete.

[http://www.opentelemac.org/images/jdownloads/screenshots/UserChoice.png](http://www.opentelemac.org/images/jdownloads/screenshots/UserChoice.png)

Try this and if it still doesn’t work, we’ll investigate the issue further.

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<div class="post-metadata">

**Author:** ![user\_16320](https://opentelemac.org/forum/letter_avatar_proxy/v4/letter/u/35a633/32.png) [@user\_16320](https://opentelemac.org/forum/u/user_16320)\
**Post date:** [January 3, 2024, 3:48pm UTC](https://opentelemac.org/forum/t/telemac-installer-erro/7354/3 "2024-01-03T15:48:26Z")

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thanks，it can works now