# Ports not recognized by Arduino IDE on Windows 7

**URL:** <https://forum.arduino.cc/t/ports-not-recognized-by-arduino-ide-on-windows-7/1413296>\
**Category:** IDE 2.x\
**Created:** [November 9, 2025, 7:30pm UTC](https://forum.arduino.cc/t/ports-not-recognized-by-arduino-ide-on-windows-7/1413296 "2025-11-09T19:30:27Z")\
**Posts on this page:** 1\
**Showing post:** 6

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**Author:** ![Etienne\_74](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/etienne_74/32/1013044_2.png) [@Etienne\_74](https://forum.arduino.cc/u/Etienne_74)\
**Post date:** [November 10, 2025, 3:19am UTC](https://forum.arduino.cc/t/ports-not-recognized-by-arduino-ide-on-windows-7/1413296/6 "2025-11-10T03:19:16Z")

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> [@ptillisch](#):
>
> Create a folder named `99.99.99` in the folder at the following path on your hard drive:
> 
> ```arduino
> C:\Users\<username>\AppData\packages\builtin\tools\mdns-discovery
> 
> ```

Do you mean  
`C:\Users\<username>\AppData\packages\builtin\tools\mdns-discovery` ( **does not exist** on my W7x64 system) **or**  
`C:\Users\<username>\AppData\Local\Arduino15\packages\builtin\tools\serial-discovery` ?

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