Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\Software\Microsoft\Windows\ShellNoRoam\MUICache]
"C:\\Program Files\\TheGun\\THEGUN.EXE"="TheGun"
"C:\\Progra~1\\TheGun\\THEGUN.EXE"="TheGun"

[HKEY_CURRENT_USER\Software\Classes\Applications\THEGUN.EXE\shell\open\command]
@="C:\\Progra~1\\TheGun\\THEGUN.EXE %1"

[HKEY_CURRENT_USER_Classes\Applications\THEGUN.EXE\shell\open\command]
@="C:\\Progra~1\\TheGun\\THEGUN.EXE %1"


You may or may not want these as well:

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.pl\OpenWithList]
"b"="THEGUN.EXE"

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.txt\OpenWithList]
"b"="THEGUN.EXE"

Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.pl\OpenWithList]
"g"="THEGUN.EXE"

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.txt\OpenWithList]
"g"="THEGUN.EXE"

[HKEY_CURRENT_USER\Software\Microsoft\Windows\ShellNoRoam\MUICache]
"C:\\Program Files\\TheGun\\THEGUN.EXE"="TheGun"
"C:\\Progra~1\\TheGun\\THEGUN.EXE"="TheGun"

[HKEY_CURRENT_USER\Software\Classes\Applications\THEGUN.EXE\shell\open\command]
@="C:\\Progra~1\\TheGun\\THEGUN.EXE %1"

[HKEY_CURRENT_USER_Classes\Applications\THEGUN.EXE\shell\open\command]
@="C:\\Progra~1\\TheGun\\THEGUN.EXE %1"

http://www.movsd.com/thegun.htm

TheGun is a great Windows Notepad replacement, but it's a bit painful in how it registers itself when you choose it to open a file.
If you save it in "C:\Program Files\TheGun\THEGUN.EXE" and add something this to your registry, it should work nicely.

Add TheGun editor to your registry

windows

Windows Registry