Okay, I have this working on my machine, but I manually hacked the registry. It's set up to treat BUM files as Photoshop documents and pretend they're BMPs (which isn't much of a pretense, since they are). The main portion of this was to make them show up in thumbnail view which does work swimmingly on my machine now. I THINK the following is the correct Regfile syntax, but if not, will someone please correct me? If it is correct, then the following placed in a text file with no lines preceding the REGEDIT4 line, and with the extension as .reg, will add the necessary keys and values to the Windows registry to make BUM files show up in thumbnail view and open with Photoshop. BEGIN BELOW RULE

REGEDIT4

[HKEY_CLASSES_ROOT.BUM]
@="Photoshop.BMPFile"
"Content Type"="image/bmp"

[HKEY_CLASSES_ROOT.BUMShellEx]


[HKEY_CLASSES_ROOT.BUMShellEx{BB2E617C-0920-11d1-9A0B-00C04FC2D6C1}]
@="{3F30C968-480A-4C6C-862D-EFC0897BB84B}"

[HKEY_CLASSES_ROOT.BUMShellNew]
"NullFile"=""

I tried it; but although it changed the file type to Photoshop.BMPFile, they remain stubbornly invisible as thumbnails. Maybe Windows has no sense of humour. I called my file 'BUMthumb.reg'. :)

Weird. I don't know what to do then. It worked on mine, but I did it manually.

Now I think about it some more, I had Windows thumbnail problems before. After installing Paint Shop Pro, Windows Explorer magically lost its ability to display thumbnails of some image types. I think the guys at Jasc sent me a reg file which fixed it - if I can still find it, I'll have a look inside to see how it works.

Couldn't find that - may have remembered it wrong anyway. In the hopes it will help, here's the new stuff that was in my registry after applying the REG file: HKEY_CLASSES_ROOT.BUM (Default) REG_SZ Photoshop.BMPFile Content Type REG_SZ image/bmp HKEY_CLASSES_ROOT.BUMShellEx (Default) REG_SZ (value not set) HKEY_CLASSES_ROOT.BUMShellEx{BB2E617C-0920-11d1-9A0B-00C04FC2D6C1} (Default) REG_SZ {3F30C968-480A-4C6C-862D-EFC0897BB84B} HKEY_CLASSES_ROOT.BUMShellNew (Default) REG_SZ (value not set) NullFile REG_SZ The format should be followable if you have regedit in front of you. I'd be interested to know if this has come out differently from what you intended. This is Windows 2000 on an account with administrator privileges by the way.

Further to that, on this machine some TIFF files produce thumbnails in Explorer, and some don't. So it may not be a very good experimental subject. :)

Line 7 should read: @="{7376D660-C583-11d0-A3A5-00C04FD706EC}" It now works on Win2K.