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John & Bruce,

I've done some more digging. If I go to File>Open Measurement File, I get a pop-up box saying Look In: REW Cal Files and it defaults to Files of Type: .mdat. Now, the files that were generated when I calibrated my sound card are in there. And, if I ask it for Files of Type: All Files, two of the files that I recently saved are listed but if I select them and try to open them, I get a 'Load measured data set error' that says - C:\Documents and Settings\John\My Documents\REW Cal Files\FE167E SW1 Jul 15 13.mdat not found. Similar with the other file that I saved. BTW, I think this file (beginning 'FE167E') has been truncated; I may have inadvertently included a colon in the original but I would have expected an error message if that was the case when I tried to save it. So, I'm really not sure what is going on.

I don't want to re-install REW if I can avoid it because I would presumably have to re-calibrate my sound card, etc. before being able to run actual room measurements.

Sorry this is a bit heavy-going but I need your help, guys.

What are the actual filenames and extensions of the files that are causing problems (as shown in explorer)? Do they appear differently in the file dialog in REW?

Note that the soundcard calibration files (as generated with the "Make Cal" button in Soundcard Settings) have a .cal extension, .mdat files are measurements.
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