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Can't open .c4 files
Posted: Tue Apr 18, 2023 1:46 pm
by johnsmith88
Hi folks,
I can't open .c4 (JEDMICS) files by double clicking on them. XnView just opens to the blank screen (or the Browser if you have that set to open on program start). The file opens if I go to File > Open, or by dragging the file icon onto XnView. It just doesn't open by double click. Likewise doesn't open by clicking links to .c4 files from a webpage. "Display all image file types" is enabled.
However, XnView MP works by double clicking the file. At least on this computer. But if I try it on another computer, neither Classic or MP can open on double click. So the problem is not really consistent. All other compatible filetypes open just fine.
Is this an XnView setting somewhere, or a Windows setting?
Thanks.
Re: Can't open .c4 files
Posted: Thu Apr 20, 2023 7:36 am
by xnview
do you have Settings>Display all file formats?
Re: Can't open .c4 files
Posted: Thu Apr 20, 2023 3:08 pm
by johnsmith88
Yes sir. I can open the file by dragging it onto XnView, or by using File > Open. But if I double click on the file, it just opens XnView to a blank screen.
Re: Can't open .c4 files
Posted: Thu Apr 20, 2023 3:36 pm
by xnview
you need check the registry entry for .C4
Re: Can't open .c4 files
Posted: Thu Apr 20, 2023 3:47 pm
by johnsmith88
I thought it might have something to do with the registry. Any particular registry entry I should look at?
Re: Can't open .c4 files
Posted: Tue May 02, 2023 3:05 pm
by johnsmith88
Any idea what values I should change or delete in the registry? Thanks.
Re: Can't open .c4 files
Posted: Wed May 03, 2023 6:20 am
by xnview
johnsmith88 wrote: Tue May 02, 2023 3:05 pm
Any idea what values I should change or delete in the registry? Thanks.
please check .c4 entry in HKCR
Re: Can't open .c4 files
Posted: Wed May 03, 2023 3:00 pm
by johnsmith88
Here is the entry for HKEY_CLASSES_ROOT\.C4
(Default) string with data C4_auto_file
Is this correct?
Re: Can't open .c4 files
Posted: Wed May 03, 2023 6:17 pm
by xnview
and what do you have in C4_auto_file?
Re: Can't open .c4 files
Posted: Thu May 04, 2023 3:31 pm
by johnsmith88
I've been doing a little digging. Sorry for my ignorance. C4_auto_file appears several times in the registry. But I'm not really sure what to do with it. Attached is a screenshot of all the locations it appears. I'm not sure if you can gain any information from it. We might be at a dead end here. Thanks.
Code: Select all
Windows Registry Editor Version 5.00
[HKEY_USERS\S-1-5-21-4276474514-3336788208-196049622-361428_Classes\C4_auto_file\shell\open\command]
""="\"C:\\Soft\\XnViewMP\\xnviewmp.exe\" \"%1\""
[HKEY_USERS\S-1-5-21-4276474514-3336788208-196049622-361428_Classes\.C4]
""="C4_auto_file"
[HKEY_USERS\S-1-5-21-4276474514-3336788208-196049622-361428_Classes\]
""="C4_auto_file"
[HKEY_USERS\S-1-5-21-4276474514-3336788208-196049622-361428\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.C4\OpenWithProgids]
"C4_auto_file"=hex(0):
[HKEY_USERS\S-1-5-21-4276474514-3336788208-196049622-361428\SOFTWARE\Microsoft\Windows\CurrentVersion\ApplicationAssociationToasts]
"C4_auto_file_.C4"=dword:00000000
[HKEY_USERS\S-1-5-21-4276474514-3336788208-196049622-361428\SOFTWARE\Classes\C4_auto_file\shell\open\command]
""="\"C:\\Soft\\XnViewMP\\xnviewmp.exe\" \"%1\""
[HKEY_USERS\S-1-5-21-4276474514-3336788208-196049622-361428\SOFTWARE\Classes\.C4]
""="C4_auto_file"
[HKEY_USERS\S-1-5-21-4276474514-3336788208-196049622-361428\SOFTWARE\Classes\]
""="C4_auto_file"
[HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.C4\OpenWithProgids]
"C4_auto_file"=hex(0):
[HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\ApplicationAssociationToasts]
"C4_auto_file_.C4"=dword:00000000
[HKEY_CURRENT_USER\SOFTWARE\Classes\C4_auto_file\shell\open\command]
""="\"C:\\Soft\\XnViewMP\\xnviewmp.exe\" \"%1\""
[HKEY_CURRENT_USER\SOFTWARE\Classes\.C4]
""="C4_auto_file"
[HKEY_CURRENT_USER\SOFTWARE\Classes\]
""="C4_auto_file"
[HKEY_CLASSES_ROOT\C4_auto_file\shell\open\command]
""="\"C:\\Soft\\XnViewMP\\xnviewmp.exe\" \"%1\""
[HKEY_CLASSES_ROOT\.C4]
""="C4_auto_file"
[HKEY_CLASSES_ROOT\]
""="C4_auto_file"