Vacon NCDrive TLF files

hello,
After a service engineer came for maintenance and testing of our drive he sent us some files and recordings of our drive. But the format these files are in are not readable by the vacon software. 1 file i can open with extension .TLF but the other and more important files come in the format of .FLT0 until .FLT7 . the files arrived in a zipped folder which i extracted them from.
Does anybody know how to use the .FLTx files?
any help would be much appreciated.
 
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