new problem with saved .tif files not opening...

I have recently added a server to my work flow, & as a result of taking on an employee as well as the upcoming addition of new equipment, I have also added 2 computers. I'm not sure which, if any, of these changes contributed to this new problem... but I have been having a lot of trouble on several occassions... but not every time... when I save a .tif file to the folder on the server, & then later I try to open it on another computer.

The problem is this... If I try to import one of these problem files into Omega it says "Invalid file format" ... if I try to open it in photoshop, it says something like "can not open the file, it is locked. Go to properties in windows explorer & unlock file"

..but if I go to properties in windows explorer... nothing is unusual... it isn'r checked as "read only", "hidden" or "archive"... & I've never seen it say "lock" in the properties window???

 

Thanks guys... I'm not sure what makes some files do this & other files not do it, but I copied the image from the offending file (on the one machine I could still open it from) & pasted in a new page, then saved to the server & it opened fine in Omega & Photoshop on the other computer.

As for Bobby's suggestion (it is a dell server on a PC network) when I tried to copy it to the hard drive of the production workstation it would not allow this & brought up the same "lock" dialog box.

Tony, I remember "archive" being one of the boxes I had seen in the past, but when I checked the properties of this particular file it only offered hidden or read only. You suggest that "I set the archive attribute " I did see an "advanced" button next to those other choices, but when there it had 2 boxes checked for "file is ready for archiving" or "for fast searching..."

...so how do I set the attributes?

This issue is not critical since my copy/paste steps got me back in business... but it has been a somewhat annoying recurring problem, although intermittant... so learning more about how to minimize it would be great!