c# barcode creator Setting Default Programs, File Type Associations, and AutoPlay Options in C#

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Setting Default Programs, File Type Associations, and AutoPlay Options
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To see which defaults Firefox currently owns (and modify particular ones if we want), we click Choose Defaults For This Program. The dialog box then lists file extensions and protocols that are possibilities for Firefox (see Figure 3-29).
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Figure 3-29 Firefox owns the SHTML File, XHT File, and XHTML File associations; the rest belong to Internet Explorer.
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If we wanted to make Firefox the default program for other extensions or protocols, we could select the check boxes associated with these protocols, and then click Save. To make Firefox the default for everything, we could select all the check boxes or, more simply, return to the dialog box shown in Figure 3-28 and click Set This Program As Default.
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Changing File Type Associations
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The second item on the menu shown in Figure 3-26 approaches the matter of file-toprogram associations from the perspective of the file type. Figure 3-30 on the next page shows a list of file types comparable to what you would see if you clicked this menu item.
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Figure 3-30 The list of file extensions shown in this dialog box lets you change the program or programs associated with indiidual file types.
The file-type list is alphabetized by extension. For each extension, the list shows a description of the file and the program that is currently set as the default application for that file type. So, for example, in Figure 3-30, we see that the extension .bmp represents Bitmap Image files, and that Windows Photo Gallery is the program currently associated with such files. In other words, double-clicking a .bmp file in Windows Explorer, as things now stand, will open that file in Windows Photo Gallery. To change the default, click Change Program. As Figure 3-31 shows, the Open With dialog box that appears has a section called Recommended Programs and a section called Other Programs. The Recommended Programs section includes the current default (Windows Photo Gallery) and other programs that are registered as being capable of opening files of the current type (bitmap images, in this case). The dialog box also includes an Always Use The Selected Program To Open This Kind Of File check box, which is grayed out and unavailable. The reason the check box is unavailable is that Windows assumes that because you have arrived in the Open With dialog box by way of the Default Programs command (on the Start menu or in Control Panel), the only business you have here is to change the program that s always used to open the selected file type. (As we ll see in a moment, there s another way to get to this dialog box.)
Setting Default Programs, File Type Associations, and AutoPlay Options
Figure 3-31 To change the default program for a file type, make your selection in the Recommended Programs section of this dialog box, and then click OK.
The Other Programs section of this dialog box will at first appear unpopulated. To make its contents visible, click the little arrow at the end of the dividing line between the Recommended Programs section and the Other Programs section. (We ve already done that in Figure 3-31.) Be careful. The programs listed in Other Programs are simply commonplace applications installed on your system. They are almost guaranteed to be bad choices for the selected file type. If you select one of these and click OK, it will become the default program for the current file type, no matter how unsuitable it might be. You can fix that easily enough, by returning to the Open With dialog box. But, as Figure 3-32 shows, the spurned program will make a nuisance of itself by remaining in the Recommended Programs dialog box. (For information about getting it out of there, see the Troubleshooting sidebar on the next page.)
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