Link file extension ".my_ext" to "ext_handler.ahk %filepath%" Topic is solved

[stepanVL]

Goal: add this Windows behavior (pseudo code):

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if( (doubleclick on %file%) and  (%file%.ftype = ".my_ext"))
	run  "C:\MyScripts\my_extension_handler.ahk %file%"
 

I have a file "C:\1\myfile.my_ext" containing text "1234test"
I wrote a script "C:\MyScripts\my_extension_handler.ahk" that displays content of the file given as first parameter
Script works as expected when I run it in a terminal using

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C:\MyScripts\my_extension_handler.ahk C:\1\myfile.my_ext"

I associated this script with ".my_ext" : properties -> Open with -> C:\extension_handler.ahk
When I doubleclick "myfile.my_ext" I get "This app can't run on your PC error message".
How to associate double click with Windows launching this script and passing full file path as a parameter?

---------------------------------
Update:
---------------------------------
I've ran this code in cmd as an admin:

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assoc .my_ext=myownext
ftype myownext="C:\MyScripts\my_extension_handler.ahk" "%1"
regsvr32 /i shell32.dll

Association registered successfully, but I still get the same error..

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Loop, %0%  ; For each parameter:
{
	
	if (! param){
		global param := []	
		global index := 0 	
		}	 
	index := index + 1
	param[index] :=  %A_Index%		
}
strElements := ""
for index, element in param ; Recommended approach in most cases.
{
    strElements := strElements . "Element number " . index . " is " . element . "`r`n"
}
MsgBox % strElements

str := ""
source := param[1] 
MsgBox % "Source is " . source
Loop, read,   %source% ; should read selectedfile
    str  := str  . "`r`n" .  A_LoopReadLine

MsgBox % str

[Guest]

Replace your sourcefile line with sourcefile = %1%
Make sure you're association is

C:\MyScripts\my_extension_handler.ahk "%1"

%1 is the file you double click, press enter on

%1% is a command line parameter passed on to the script, see "Script Parameter" here https://autohotkey.com/docs/Scripts.htm#cmd

[evilC]

AHK does not use \ for escape characters, it uses `, so you do not need any escaping at all for backslashes

C:\\1\\myfile.my_ext should be C:\1\myfile.my_ext

[stepanVL]

AHK does not use \ for escape characters, it uses `, so you do not need any escaping at all for backslashes

I changed my post. Double slash was a blunder, but my main problem is windows file association.

[robertcollier4]

Use the following reg script (save it to a filename with extension .reg and then run it):

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Windows Registry Editor Version 5.00

; Remove previously wrongly made associations
[-HKEY_LOCAL_MACHINE\SOFTWARE\Classes\.my_ext]
[-HKEY_LOCAL_MACHINE\SOFTWARE\Classes\my_ext]
[-HKEY_CURRENT_USER\Software\Classes\.my_ext]
[-HKEY_CURRENT_USER\Software\Classes\my_ext]

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\.my_ext]
@="my_ext"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\my_ext\shell\open\command]
@="\"C:\\Program Files\\AutoHotkey\\AutoHotkeyU32.exe\" \"C:\\MyScripts\\my_extension_handler.ahk\" \"%1\" %*"

[stepanVL]

This reg file did the trick. Thank you for commenting it.

I will post working code in case someone else wants to link extension to ahk. I use this one to initialize ahk with settings storred in a ".1tg" file.

update.reg

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; Remove previously wrongly made associations 
[-HKEY_LOCAL_MACHINE\SOFTWARE\Classes\.1tg]
[-HKEY_LOCAL_MACHINE\SOFTWARE\Classes\1tg]
[-HKEY_CURRENT_USER\Software\Classes\.1tg]
[-HKEY_CURRENT_USER\Software\Classes\1tg]
; comment out above lines if you haven't mess up registry yet

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\.1tg]
@="1tg"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\1tg\shell\open\command]
@="\"C:\\Program Files\\AutoHotkey\\AutoHotkeyU32.exe\" \"C:\\AHK\\tags\\ThisScriptOpensTG.ahk\" \"%1\" %*"

C:\AHK\tags\ThisScriptOpensTG.ahk

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#NoEnv  ; Recommended for performance and compatibility with future AutoHotkey releases.
; #Warn  ; Enable warnings to assist with detecting common errors.
SendMode Input  ; Recommended for new scripts due to its superior speed and reliability.
SetWorkingDir %A_ScriptDir%  ; Ensures a consistent starting directory.

MsgBox % "main script"

Loop, %0%  ; For each parameter:
{
	
	if (! param){
		global param := []	
		global index := 0 	
		}	 
	index := index + 1
	param[index] :=  %A_Index%		
}
strElements := ""
for index, element in param ; Recommended approach in most cases.
{
    strElements := strElements . "Element number " . index . " is " . element . "`r`n"
}
MsgBox % strElements

str := ""
source := param[1]
MsgBox % "Source is " . source
Loop, read,   %source% ; should read selectedfile
    str  := str  . "`r`n" .  A_LoopReadLine
MsgBox % str