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Home » Boards » Stylus Studio Developer Network » Stylus Studio Technical Forum » What Is This vmm File?
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John SaundersSubject: What Is This vmm File?
Author: John Saunders
Date: 16 May 2007 06:03 PM
Originally Posted: 16 May 2007 06:01 PM
What Is "C:\Temp\STY9D3.vmm" and Why is it 256MB? It goes away when I exit Stylus Studio Professional 2007 R2.


ImageSTY9D3.vmm(1).jpg
Windows Explorer Listing of a Large File
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Minollo I.Subject: What Is This vmm File?
Author: Minollo I.
Date: 16 May 2007 06:10 PM
It's a virtual memory map file. Stylus Studio may create one or more of those files when you open a large XML document for editing.
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John SaundersSubject: What Is This vmm File?
Author: John Saunders
Date: 16 May 2007 06:42 PM
I'm pretty sure I didn't open a 256MB file to read. How big a file do I have to open before this happens, and how big a .vmm file will be opened therefore?

John
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Minollo I.Subject: What Is This vmm File?
Author: Minollo I.
Date: 16 May 2007 08:58 PM
.vmm files are allocated in "virtual" chunks of 256MB; keep in mind that the file doesn't "really" allocate 256MB of space on disk; it's a sparse file that *can* virtually grow up to 256MB, but the initial physical size is around 16MB; if you are curious about sparse files and Win32 support for them, take a look at http://msdn2.microsoft.com/en-us/library/aa364596.aspx.

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John SaundersSubject: What Is This vmm File?
Author: John Saunders
Date: 16 May 2007 09:02 PM
Thanks for telling me it's a sparse file. The 256MB isn't so startling now!

John
 
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