Just saw in the most recent PC Magazine a Q&A about the NTFS file system on Windows XP. It seems that NTFS uses a different method of accounting for the timestamp on files, so when Daylight Savings Time starts or stops, the timestamp no longer matches the timestamp kept elsewhere on the system for that file.
So it would thus stand to reason that when Vegas opens a file on the timeline, it looks to see if the accompanying sfk file matches the timestamp. If it doesn't, Vegas assumes the data file has changed, and thus decides to build a new sfk file to match.
On my system my C drive is still FAT32 but my video drives are all NTFS. What I don't know is whether Vegas would do this rebuilding effort if my C drive were also NTFS, because then presumably the timestamps would match.
So it would thus stand to reason that when Vegas opens a file on the timeline, it looks to see if the accompanying sfk file matches the timestamp. If it doesn't, Vegas assumes the data file has changed, and thus decides to build a new sfk file to match.
On my system my C drive is still FAT32 but my video drives are all NTFS. What I don't know is whether Vegas would do this rebuilding effort if my C drive were also NTFS, because then presumably the timestamps would match.