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Piotr Dobrogost
Piotr Dobrogost
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Just to extend Gareth's answer:

From playing with the registry it looks like

  • entries from HKEY_CURRENT_USER\Software\Classes override entries from HKEY_LOCAL_MACHINE\Software\Classes in the HKEY_CLASSES_ROOT\Software\Classes
  • setting file's extention association from command line using assoc command acts upon HKEY_LOCAL_MACHINE\Software\Classes
  • setting file type association from command line using ftype command acts upon HKEY_LOCAL_MACHINE\Software\Classes
  • using REG_EXPAND_SZ type of registry key for extension or file type and environment variable in the key's value allows to set the default program per command line session

Just to extend Gareth's answer:

From playing with the registry it looks like

  • entries from HKEY_CURRENT_USER\Software\Classes override entries from HKEY_LOCAL_MACHINE\Software\Classes in the HKEY_CLASSES_ROOT\Software\Classes
  • setting file's extention association from command line using assoc command acts upon HKEY_LOCAL_MACHINE\Software\Classes
  • setting file type association from command line using ftype command acts upon HKEY_LOCAL_MACHINE\Software\Classes
  • using REG_EXPAND_SZ type of registry key for extension or file type and environment variable in the key's value allows to set the default program per command line session

Just to extend Gareth's answer:

From playing with the registry it looks like

  • entries from HKEY_CURRENT_USER\Software\Classes override entries from HKEY_LOCAL_MACHINE\Software\Classes in the HKEY_CLASSES_ROOT\Software\Classes
  • setting file's extention association from command line using assoc command acts upon HKEY_LOCAL_MACHINE\Software\Classes
  • setting file type association from command line using ftype command acts upon HKEY_LOCAL_MACHINE\Software\Classes
Source Link
Piotr Dobrogost
Piotr Dobrogost
  • 5.7k
  • 15
  • 59
  • 83

Just to extend Gareth's answer:

From playing with the registry it looks like

  • entries from HKEY_CURRENT_USER\Software\Classes override entries from HKEY_LOCAL_MACHINE\Software\Classes in the HKEY_CLASSES_ROOT\Software\Classes
  • setting file's extention association from command line using assoc command acts upon HKEY_LOCAL_MACHINE\Software\Classes
  • setting file type association from command line using ftype command acts upon HKEY_LOCAL_MACHINE\Software\Classes
  • using REG_EXPAND_SZ type of registry key for extension or file type and environment variable in the key's value allows to set the default program per command line session