picture file.
Images.
.jpg is a picture format.
* matches anything. *.jpg would mean any file with a .jpg extension. 1*.jpg would mean any file where the name begins with 1 and ends with a .jpg ? matches any single character. ?.jpg would match a.jpg, 1.jpg, or F.jpg but not a1.jpg. Several ? wildcards can be used so that ??.jpg would match any jpg file with a two letter name.
Just change the extension (Rename).There is no difference between jpg and jpeg as file types ot kind of information they contain.
Image file
File extension. Such as .docx, .wmv, .jpg
yes
.html is not an image file, so it can't be converted to .jpg unless the .html file has images in it, in which case you would show extensions and then click in the name box and change .html to .jpg
In many operating systems, an asterisk (*) in a file name is a wild card, matching any character or characters. For example, abc*.jpg will match abc.jpg, abc123.jpg, abcxyz.jpg, and abcr8ier93.jpg.
It depends on your file system. Some filesystems are CASE sensitive but typically JPG and jpg are the same thing.
.jpg
you should use software coverter jpg to pdf, you can search with keyword jpg to pdf on google